[0, 15, 50]: 2018-08-05
  - Allow ``YAML()`` as a context manager for output, thereby making it much easier
    to generate multi-documents in a stream. 
  - Fix issue with incorrect type information for `load()` and `dump()` (reported 
    by `Jimbo Jim <https://bitbucket.org/jimbo1qaz/>`__)

[0, 15, 49]: 2018-08-05
  - fix preservation of leading newlines in root level literal style scalar,
    and preserve comment after literal style indicator (``|  # some comment``)
    Both needed for round-tripping multi-doc streams in 
    `ryd <https://pypi.org/project/ryd/>`__.

[0, 15, 48]: 2018-08-03
  - housekeeping: ``oitnb`` for formatting, mypy 0.620 upgrade and conformity

[0, 15, 47]: 2018-07-31
  - fix broken 3.6 manylinux1 (result of an unclean ``build`` (reported by 
    `Roman Sichnyi <https://bitbucket.org/rsichnyi-gl/>`__)


[0, 15, 46]: 2018-07-29
  - fixed DeprecationWarning for importing from ``collections`` on 3.7
    (issue 210, reported by `Reinoud Elhorst
    <https://bitbucket.org/reinhrst/>`__). It was `difficult to find
    why tox/pytest did not report
    <https://stackoverflow.com/q/51573204/1307905>`__ and as time
    consuming to actually `fix
    <https://stackoverflow.com/a/51573205/1307905>`__ the tests.

[0, 15, 46]: 2018-07-29
  - fixed DeprecationWarning for importing from ``collections`` on 3.7
    (issue 210, reported by `Reinoud Elhorst
    <https://bitbucket.org/reinhrst/>`__). It was `difficult to find
    why tox/pytest did not report
    <https://stackoverflow.com/q/51573204/1307905>`__ and as time
    consuming to actually `fix
    <https://stackoverflow.com/a/51573205/1307905>`__ the tests.

[0, 15, 45]: 2018-07-29
  - fixed DeprecationWarning for importing from ``collections`` on 3.7
    (issue 210, reported by `Reinoud Elhorst
    <https://bitbucket.org/reinhrst/>`__). It was `difficult to find
    why tox/pytest did not report
    <https://stackoverflow.com/q/51573204/1307905>`__ and as time
    consuming to actually `fix
    <https://stackoverflow.com/a/51573205/1307905>`__ the tests.

[0, 15, 45]: 2018-07-26
  - After adding failing test for ``YAML.load_all(Path())``, remove StopIteration 
    (PR provided by `Zachary Buhman <https://bitbucket.org/buhman/>`__,
    also reported by `Steven Hiscocks <https://bitbucket.org/sdhiscocks/>`__.

[0, 15, 45]: 2018-07-26
  - After adding failing test for ``YAML.load_all(Path())``, remove StopIteration 
    (PR provided by `Zachary Buhman <https://bitbucket.org/buhman/>`__,
    also reported by `Steven Hiscocks <https://bitbucket.org/sdhiscocks/>`__.

[0, 15, 44]: 2018-07-14
  - Correct loading plain scalars consisting of numerals only and
    starting with `0`, when not explicitly specifying YAML version
    1.1. This also fixes the issue about dumping string `'019'` as
    plain scalars as reported by `Min RK
    <https://bitbucket.org/minrk/>`__, that prompted this chance.

[0, 15, 43]: 2018-07-12
  - merge PR33: Python2.7 on Windows is narrow, but has no
    ``sysconfig.get_config_var('Py_UNICODE_SIZE')``. (merge provided by
    `Marcel Bargull <https://bitbucket.org/mbargull/>`__)
  - ``register_class()`` now returns class (proposed by
    `Mike Nerone <https://bitbucket.org/Manganeez/>`__}

[0, 15, 42]: 2018-07-01
  - fix regression showing only on narrow Python 2.7 (py27mu) builds
    (with help from
    `Marcel Bargull <https://bitbucket.org/mbargull/>`__ and
    `Colm O'Connor <>`__).
  - run pre-commit ``tox`` on Python 2.7 wide and narrow, as well as
    3.4/3.5/3.6/3.7/pypy

[0, 15, 41]: 2018-06-27
  - add detection of C-compile failure (investigation prompted by 
    `StackOverlow <https://stackoverflow.com/a/51057399/1307905>`__ by 
    `Emmanuel Blot <https://stackoverflow.com/users/8233409/emmanuel-blot>`__),
    which was removed while no longer dependent on ``libyaml``, C-extensions
    compilation still needs a compiler though.

[0, 15, 40]: 2018-06-18
  - added links to landing places as suggested in issue 190 by
    `KostisA <https://bitbucket.org/ankostis/>`__
  - fixes issue #201: decoding unicode escaped tags on Python2, reported
    by `Dan Abolafia <https://bitbucket.org/danabo/>`__

[0, 15, 39]: 2018-06-16
  - merge PR27 improving package startup time (and loading when regexp not 
    actually used), provided by 
    `Marcel Bargull <https://bitbucket.org/mbargull/>`__

[0, 15, 38]: 2018-06-13
  - fix for losing precision when roundtripping floats by
    `Rolf Wojtech <https://bitbucket.org/asomov/>`__
  - fix for hardcoded dir separator not working for Windows by
    `Nuno André <https://bitbucket.org/nu_no/>`__
  - typo fix by `Andrey Somov <https://bitbucket.org/asomov/>`__

[0, 15, 37]: 2018-03-21
  - again trying to create installable files for 187

[0, 15, 36]: 2018-02-07
  - fix issue 187, incompatibility of C extension with 3.7 (reported by
    Daniel Blanchard)

[0, 15, 35]: 2017-12-03
  - allow ``None`` as stream when specifying ``transform`` parameters to
    ``YAML.dump()``.
    This is useful if the transforming function doesn't return a meaningful value
    (inspired by `StackOverflow <https://stackoverflow.com/q/47614862/1307905>`__ by
    `rsaw <https://stackoverflow.com/users/406281/rsaw>`__).

[0, 15, 34]: 2017-09-17
  - fix for issue 157: CDumper not dumping floats (reported by Jan Smitka)

[0, 15, 33]: 2017-08-31
  - support for "undefined" round-tripping tagged scalar objects (in addition to
    tagged mapping object). Inspired by a use case presented by Matthew Patton
    on `StackOverflow <https://stackoverflow.com/a/45967047/1307905>`__.
  - fix issue 148: replace cryptic error message when using !!timestamp with an
    incorrectly formatted or non- scalar. Reported by FichteFoll.

[0, 15, 32]: 2017-08-21
  - allow setting ``yaml.default_flow_style = None`` (default: ``False``) for
    for ``typ='rt'``.
  - fix for issue 149: multiplications on ``ScalarFloat`` now return ``float``

[0, 15, 31]: 2017-08-15
  - fix Comment dumping

[0, 15, 30]: 2017-08-14
  - fix for issue with "compact JSON" not parsing: ``{"in":{},"out":{}}``
    (reported on `StackOverflow <https://stackoverflow.com/q/45681626/1307905>`_ by
    `mjalkio <https://stackoverflow.com/users/5130525/mjalkio>`_

[0, 15, 29]: 2017-08-14
  - fix issue #51: different indents for mappings and sequences (reported by 
    Alex Harvey)
  - fix for flow sequence/mapping as element/value of block sequence with 
    sequence-indent minus dash-offset not equal two.

[0, 15, 28]: 2017-08-13
  - fix issue #61: merge of merge cannot be __repr__-ed (reported by Tal Liron)

[0, 15, 27]: 2017-08-13
  - fix issue 62, YAML 1.2 allows ``?`` and ``:`` in plain scalars if non-ambigious
    (reported by nowox)
  - fix lists within lists which would make comments disappear

[0, 15, 26]: 2017-08-10
  - fix for disappearing comment after empty flow sequence (reported by
    oit-tzhimmash)

[0, 15, 25]: 2017-08-09
  - fix for problem with dumping (unloaded) floats (reported by eyenseo)

[0, 15, 24]: 2017-08-09
  - added ScalarFloat which supports roundtripping of 23.1, 23.100,
    42.00E+56, 0.0, -0.0 etc. while keeping the format. Underscores in mantissas
    are not preserved/supported (yet, is anybody using that?).
  - (finally) fixed longstanding issue 23 (reported by `Antony Sottile
    <https://bitbucket.org/asottile/>`_), now handling comment between block
    mapping key and value correctly
  - warn on YAML 1.1 float input that is incorrect (triggered by invalid YAML
    provided by Cecil Curry)
  - allow setting of boolean representation (`false`, `true`) by using:
    ``yaml.boolean_representation = [u'False', u'True']``

[0, 15, 23]: 2017-08-01
  - fix for round_tripping integers on 2.7.X > sys.maxint (reported by ccatterina)

[0, 15, 22]: 2017-07-28
  - fix for round_tripping singe excl. mark tags doubling (reported and fix by Jan Brezina)

[0, 15, 21]: 2017-07-25
  - fix for writing unicode in new API, https://stackoverflow.com/a/45281922/1307905

[0, 15, 20]: 2017-07-23
  - wheels for windows including C extensions

[0, 15, 19]: 2017-07-13
  - added object constructor for rt, decorator ``yaml_object`` to replace YAMLObject.
  - fix for problem using load_all with Path() instance
  - fix for load_all in combination with zero indent block style literal
    (``pure=True`` only!)

[0, 15, 18]: 2017-07-04
  - missing ``pure`` attribute on ``YAML`` useful for implementing `!include` tag
    constructor for `including YAML files in a YAML file
    <https://stackoverflow.com/a/44913652/1307905>`_
  - some documentation improvements
  - trigger of doc build on new revision

[0, 15, 17]: 2017-07-03
  - support for Unicode supplementary Plane **output** with allow_unicode
    (input was already supported, triggered by
    `this <https://stackoverflow.com/a/44875714/1307905>`_ Stack Overflow Q&A)

[0, 15, 16]: 2017-07-01
  - minor typing issues (reported and fix provided by
    `Manvendra Singh <https://bitbucket.org/manu-chroma/>`_)
  - small doc improvements

[0, 15, 15]: 2017-06-27
  - fix for issue 135, typ='safe' not dumping in Python 2.7
    (reported by Andrzej Ostrowski <https://bitbucket.org/aostr123/>`_)

[0, 15, 14]: 2017-06-25
  - setup.py: change ModuleNotFoundError to ImportError (reported and fix by Asley Drake)

[0, 15, 13]: 2017-06-24
  - suppress duplicate key warning on mappings with merge keys (reported by
    Cameron Sweeney)

[0, 15, 12]: 2017-06-24
  - remove fatal dependency of setup.py on wheel package (reported by
    Cameron Sweeney)

[0, 15, 11]: 2017-06-24
  - fix for issue 130, regression in nested merge keys (reported by
    `David Fee <https://bitbucket.org/dfee/>`_)

[0, 15, 10]: 2017-06-24
  - fix for issue 130, regression in nested merge keys (reported by
    `David Fee <https://bitbucket.org/dfee/>`_)

[0, 15, 10]: 2017-06-23
  - top level PreservedScalarString not indented if not explicitly asked to
  - remove Makefile (not very useful anyway)
  - some mypy additions

[0, 15, 9]: 2017-06-16
  - fix for issue 127: tagged scalars were always quoted and seperated
    by a newline when in a block sequence (reported and largely fixed by
    `Tommy Wang <https://bitbucket.org/twang817/>`_)

[0, 15, 8]: 2017-06-15
  - allow plug-in install via ``install ruamel.yaml[jinja2]``

[0, 15, 8]: 2017-06-15
  - allow plug-in install via ``install ruamel.yaml[jinja2]``

[0, 15, 7]: 2017-06-14
  - add plug-in mechanism for load/dump pre resp. post-processing

[0, 15, 6]: 2017-06-10
  - a set() with duplicate elements now throws error in rt loading
  - support for toplevel column zero literal/folded scalar in explicit documents

[0, 15, 5]: 2017-06-08
  - repeat `load()` on a single `YAML()` instance would fail.

(0, 15, 4) 2017-06-08: |
  - `transform` parameter on dump that expects a function taking a
    string and returning a string. This allows transformation of the output
    before it is written to stream.
  - some updates to the docs

(0, 15, 3) 2017-06-07:
  - No longer try to compile C extensions on Windows. Compilation can be forced by setting
    the environment variable `RUAMEL_FORCE_EXT_BUILD` to some value
    before starting the `pip install`.

(0, 15, 2) 2017-06-07:
  - update to conform to mypy 0.511:mypy --strict

(0, 15, 1) 2017-06-07:
  - Any `duplicate keys  <http://yaml.readthedocs.io/en/latest/api.html#duplicate-keys>`_
    in mappings generate an error (in the old API this change generates a warning until 0.16)
  - dependecy on ruamel.ordereddict for 2.7 now via extras_require

(0, 15, 0) 2017-06-04:
  - it is now allowed to pass in a ``pathlib.Path`` as "stream" parameter to all
    load/dump functions
  - passing in a non-supported object (e.g. a string) as "stream" will result in a
    much more meaningful YAMLStreamError.
  - assigning a normal string value to an existing CommentedMap key or CommentedSeq
    element will result in a value cast to the previous value's type if possible.

(0, 14, 12) 2017-05-14:
  - fix for issue 119, deepcopy not returning subclasses (reported and PR by
    Constantine Evans <cevans@evanslabs.org>)

(0, 14, 11) 2017-05-01:
  - fix for issue 103 allowing implicit documents after document end marker line (``...``)
    in YAML 1.2

(0, 14, 10) 2017-04-26:
  - fix problem with emitting using cyaml

(0, 14, 9) 2017-04-22:
  - remove dependency on ``typing`` while still supporting ``mypy``
    (http://stackoverflow.com/a/43516781/1307905)
  - fix unclarity in doc that stated 2.6 is supported (reported by feetdust)

(0, 14, 8) 2017-04-19:
  - fix Text not available on 3.5.0 and 3.5.1, now proactively setting version guards
    on all files (reported by `João Paulo Magalhães <https://bitbucket.org/jpmag/>`_)

(0, 14, 7) 2017-04-18:
  - round trip of integers (decimal, octal, hex, binary) now preserve
    leading zero(s) padding and underscores. Underscores are presumed
    to be at regular distances (i.e. ``0o12_345_67`` dumps back as
    ``0o1_23_45_67`` as the space from the last digit to the
    underscore before that is the determining factor).

(0, 14, 6) 2017-04-14:
  - binary, octal and hex integers are now preserved by default. This
    was a known deficiency. Working on this was prompted by the issue report (112)
    from devnoname120, as well as the additional experience with `.replace()`
    on `scalarstring` classes.
  - fix issues 114 cannot install on Buildozer (reported by mixmastamyk).
    Setting env. var ``RUAMEL_NO_PIP_INSTALL_CHECK`` will suppress ``pip``-check.

(0, 14, 5) 2017-04-04:
  - fix issue 109 None not dumping correctly at top level (reported by Andrea Censi)
  - fix issue 110 .replace on Preserved/DoubleQuoted/SingleQuoted ScalarString
    would give back "normal" string (reported by sandres23)

(0, 14, 4) 2017-03-31:
  - fix readme

(0, 14, 3) 2017-03-31:
  - fix for 0o52 not being a string in YAML 1.1 (reported on
    `StackOverflow Q&A 43138503><http://stackoverflow.com/a/43138503/1307905>`_ by
    `Frank D <http://stackoverflow.com/users/7796630/frank-d>`_

(0, 14, 2) 2017-03-23:
  - fix for old default pip on Ubuntu 14.04 (reported by Sébastien Maccagnoni-Munch)

(0.14.1) 2017-03-22:
  - fix Text not available on 3.5.0 and 3.5.1 (reported by Charles Bouchard-Légaré)

(0.14.0) 2017-03-21:
  - updates for mypy --strict
  - preparation for moving away from inheritance in Loader and Dumper, calls from e.g.
    the Representer to the Serializer.serialize() are now done via the attribute
    .serializer.serialize(). Usage of .serialize() outside of Serializer will be
    deprecated soon
  - some extra tests on main.py functions

(0.13.14) 2017-02-12:
  - fix for issue 97, clipped block scalar followed by empty lines and comment
    would result in two CommentTokens of which the first was dropped.
    (reported by Colm O'Connor)

(0.13.13) 2017-01-28:
  - fix for issue 96, prevent insertion of extra empty line if indented mapping entries
    are separated by an empty line (reported by Derrick Sawyer)

(0.13.11) 2017-01-23:
  - allow ':' in flow style scalars if not followed by space. Also don't
    quote such scalar as this is no longer necessary.
  - add python 3.6 manylinux wheel to PyPI

(0.13.10) 2017-01-22:
  - fix for issue 93, insert spurious blank line before single line comment
    between indented sequence elements (reported by Alex)

(0.13.9) 2017-01-18:
  - fix for issue 92, wrong import name reported by the-corinthian

(0.13.8) 2017-01-18:
  - fix for issue 91, when a compiler is unavailable reported by Maximilian Hils
  - fix for deepcopy issue with TimeStamps not preserving 'T', reported on
    `StackOverflow Q&A <http://stackoverflow.com/a/41577841/1307905>`_ by
    `Quuxplusone <http://stackoverflow.com/users/1424877/quuxplusone>`_

(0.13.7) 2016-12-27:
  - fix for issue 85, constructor.py importing unicode_literals caused mypy to fail
    on 2.7 (reported by Peter Amstutz)

(0.13.6) 2016-12-27:
  - fix for issue 83, collections.OrderedDict not representable by SafeRepresenter
    (reported by Frazer McLean)

(0.13.5) 2016-12-25:
  - fix for issue 84, deepcopy not properly working (reported by Peter Amstutz)

(0.13.4) 2016-12-05:
  - another fix for issue 82, change to non-global resolver data broke implicit type
    specification

(0.13.3) 2016-12-05:
  - fix for issue 82, deepcopy not working (reported by code monk)

(0.13.2) 2016-11-28:
  - fix for comments after empty (null) values  (reported by dsw2127 and cokelaer)

(0.13.1) 2016-11-22:
  - optimisations on memory usage when loading YAML from large files (py3 -50%, py2 -85%)

(0.13.0) 2016-11-20:
  - if ``load()`` or ``load_all()`` is called with only a single argument
    (stream or string)
    a UnsafeLoaderWarning will be issued once. If appropriate you can surpress this
    warning by filtering it. Explicitly supplying the ``Loader=ruamel.yaml.Loader``
    argument, will also prevent it from being issued. You should however consider
    using ``safe_load()``, ``safe_load_all()`` if your YAML input does not use tags.
  - allow adding comments before and after keys (based on
    `StackOveflow Q&A <http://stackoverflow.com/a/40705671/1307905>`_  by
    `msinn <http://stackoverflow.com/users/7185467/msinn>`_)

(0.12.18) 2016-11-16:
  - another fix for numpy (re-reported independently by PaulG & Nathanial Burdic)

(0.12.17) 2016-11-15:
  - only the RoundTripLoader included the Resolver that supports YAML 1.2
    now all loaders do (reported by mixmastamyk)

(0.12.16) 2016-11-13:
  - allow dot char (and many others) in anchor name
    Fix issue 72 (reported by Shalon Wood)
  - |
    Slightly smarter behaviour dumping strings when no style is
    specified. Single string scalars that start with single quotes
    or have newlines now are dumped double quoted "'abc\nklm'" instead of

      '''abc

        klm'''

(0.12.14) 2016-09-21:
 - preserve round-trip sequences that are mapping keys
   (prompted by stackoverflow question 39595807 from Nowox)

(0.12.13) 2016-09-15:
 - Fix for issue #60 representation of CommentedMap with merge
   keys incorrect (reported by Tal Liron)

(0.12.11) 2016-09-06:
 - Fix issue 58 endless loop in scanning tokens (reported by
   Christopher Lambert)

(0.12.10) 2016-09-05:
 - Make previous fix depend on unicode char width (32 bit unicode support
   is a problem on MacOS reported by David Tagatac)

(0.12.8) 2016-09-05:
   - To be ignored Unicode characters were not properly regex matched
     (no specific tests, PR by Haraguroicha Hsu)

(0.12.7) 2016-09-03:
   - fixing issue 54 empty lines with spaces (reported by Alex Harvey)

(0.12.6) 2016-09-03:
   - fixing issue 46 empty lines between top-level keys were gobbled (but
     not between sequence elements, nor between keys in netsted mappings
     (reported by Alex Harvey)

(0.12.5) 2016-08-20:
  - fixing issue 45 preserving datetime formatting (submitted by altuin)
    Several formatting parameters are preserved with some normalisation:
  - preserve 'T', 't' is replaced by 'T', multiple spaces between date
    and time reduced to one.
  - optional space before timezone is removed
  - still using microseconds, but now rounded (.1234567 -> .123457)
  - Z/-5/+01:00 preserved

(0.12.4) 2016-08-19:
  - Fix for issue 44: missing preserve_quotes keyword argument (reported
    by M. Crusoe)

(0.12.3) 2016-08-17:
  - correct 'in' operation for merged CommentedMaps in round-trip mode
    (implementation inspired by J.Ngo, but original not working for merges)
  - iteration over round-trip loaded mappings, that contain merges. Also
    keys(), items(), values() (Py3/Py2) and iterkeys(), iteritems(),
    itervalues(), viewkeys(), viewitems(), viewvalues() (Py2)
  - reuse of anchor name now generates warning, not an error. Round-tripping such
    anchors works correctly. This inherited PyYAML issue was brought to attention
    by G. Coddut (and was long standing https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=515634)
    suppressing the warning::

        import warnings
        from ruamel.yaml.error import ReusedAnchorWarning
        warnings.simplefilter("ignore", ReusedAnchorWarning)

(0.12.2) 2016-08-16:
  - minor improvements based on feedback from M. Crusoe
    https://bitbucket.org/ruamel/yaml/issues/42/

(0.12.0) 2016-08-16:
  - drop support for Python 2.6
  - include initial Type information (inspired by M. Crusoe)

(0.11.15) 2016-08-07:
  - Change to prevent FutureWarning in NumPy, as reported by tgehring
    ("comparison to None will result in an elementwise object comparison in the future")

(0.11.14) 2016-07-06:
  - fix preserve_quotes missing on original Loaders (as reported
    by Leynos, bitbucket issue 38)

(0.11.13) 2016-07-06:
  - documentation only, automated linux wheels

(0.11.12) 2016-07-06:
  - added support for roundtrip of single/double quoted scalars using:
    ruamel.yaml.round_trip_load(stream, preserve_quotes=True)

(0.11.10) 2016-05-02:

- added .insert(pos, key, value, comment=None) to CommentedMap

(0.11.10) 2016-04-19:

- indent=2, block_seq_indent=2 works as expected

(0.11.0) 2016-02-18:
  - RoundTripLoader loads 1.2 by default (no sexagesimals, 012 octals nor
    yes/no/on/off booleans

(0.10.11) 2015-09-17:
- Fix issue 13: dependency on libyaml to be installed for yaml.h

(0.10.10) 2015-09-15:
- Python 3.5 tested with tox
- pypy full test (old PyYAML tests failed on too many open file handles)

(0.10.6-0.10.9) 2015-09-14:
- Fix for issue 9
- Fix for issue 11: double dump losing comments
- Include libyaml code
- move code from 'py' subdir for proper namespace packaging.

(0.10.5) 2015-08-25:
- preservation of newlines after block scalars. Contributed by Sam Thursfield.

(0.10) 2015-06-22:
- preservation of hand crafted anchor names ( not of the form "idNNN")
- preservation of map merges ( <<< )

(0.9) 2015-04-18:
- collections read in by the RoundTripLoader now have a ``lc`` property
  that can be quired for line and column ( ``lc.line`` resp. ``lc.col``)

(0.8) 2015-04-15:
- bug fix for non-roundtrip save of ordereddict
- adding/replacing end of line comments on block style mappings/sequences

(0.7.2) 2015-03-29:
- support for end-of-line comments on flow style sequences and mappings

(0.7.1) 2015-03-27:
- RoundTrip capability of flow style sequences ( 'a: b, c, d' )

(0.7) 2015-03-26:
- tests (currently failing) for inline sequece and non-standard spacing between
  block sequence dash and scalar (Anthony Sottile)
- initial possibility (on list, i.e. CommentedSeq) to set the flow format
  explicitly
- RoundTrip capability of flow style sequences ( 'a: b, c, d' )

(0.6.1) 2015-03-15:
- setup.py changed so ruamel.ordereddict no longer is a dependency
  if not on CPython 2.x (used to test only for 2.x, which breaks pypy 2.5.0
  reported by Anthony Sottile)

(0.6) 2015-03-11:
- basic support for scalars with preserved newlines
- html option for yaml command
- check if yaml C library is available before trying to compile C extension
- include unreleased change in PyYAML dd 20141128

(0.5) 2015-01-14:
- move configobj -> YAML generator to own module
- added dependency on ruamel.base (based on feedback from  Sess
  <leycec@gmail.com>

(0.4) 20141125:
- move comment classes in own module comments
- fix omap pre comment
- make !!omap and !!set take parameters. There are still some restrictions:
  - no comments before the !!tag
- extra tests

(0.3) 20141124:
- fix value comment occuring as on previous line (looking like eol comment)
- INI conversion in yaml + tests
- (hidden) test in yaml for debugging with auto command
- fix for missing comment in middel of simple map + test

(0.2) 20141123:
- add ext/_yaml.c etc to the source tree
- tests for yaml to work on 2.6/3.3/3.4
- change install so that you can include ruamel.yaml instead of ruamel.yaml.py
- add "yaml" utility with initial subcommands (test rt, from json)

(0.1) 20141122:
- merge py2 and py3 code bases
- remove support for 2.5/3.0/3.1/3.2 (this merge relies on u"" as
  available in 3.3 and . imports not available in 2.5)
- tox.ini for 2.7/3.4/2.6/3.3
- remove lib3/ and tests/lib3 directories and content
- commit
- correct --verbose for test application
- DATA=changed to be relative to __file__ of code
- DATA using os.sep
- remove os.path from imports as os is already imported
- have test_yaml.py exit with value 0 on success, 1 on failures, 2 on
  error
- added support for octal integers starting with '0o'
  keep support for 01234 as well as 0o1234
- commit
- added test_roundtrip_data:
  requirest a .data file and .roundtrip (empty), yaml_load .data
  and compare dump against original.
- fix grammar as per David Pursehouse:
  https://bitbucket.org/xi/pyyaml/pull-request/5/fix-grammar-in-error-messages/diff
- http://www.json.org/ extra escaped char \/
  add .skip-ext as libyaml is not updated
- David Fraser: Extract a method to represent keys in mappings, so that
  a subclass can choose not to quote them, used in repesent_mapping
  https://bitbucket.org/davidfraser/pyyaml/
- add CommentToken and percolate through parser and composer and constructor
- add Comments to wrapped mapping and sequence constructs (not to scalars)
- generate YAML with comments
- initial README