Add Python 3.6 and drop Python 3.3py36

- Badges
- Enable coveralls
  - 100% coverage
- DRY with respect to dependencies in setup.py and tox.ini
- Remove _compat.py and use of its u() function since Python 3.2 is
  dropped.
- Run doctests on all python versions.

1 files changed, 19 insertions, 5 deletions

diff --git a/README.rst b/README.rst
index 1dcb61a..ff64980 100644
--- a/README.rst
+++ b/README.rst
@@ -1,15 +1,29 @@
-``zope.location``
-=================
+===================
+ ``zope.location``
+===================
 
 .. image:: https://img.shields.io/pypi/v/zope.location.svg
-    :target: https://pypi.python.org/pypi/zope.location/
-    :alt: Latest Version
+        :target: https://pypi.python.org/pypi/zope.location/
+        :alt: Latest release
+
+.. image:: https://img.shields.io/pypi/pyversions/zope.location.svg
+        :target: https://pypi.org/project/zope.location/
+        :alt: Supported Python versions
 
 .. image:: https://travis-ci.org/zopefoundation/zope.location.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.location
 
+.. image:: https://coveralls.io/repos/github/zopefoundation/zope.location/badge.svg?branch=master
+        :target: https://coveralls.io/github/zopefoundation/zope.location?branch=master
+
 .. image:: https://readthedocs.org/projects/zopelocation/badge/?version=latest
         :target: http://zopelocation.readthedocs.org/en/latest/
         :alt: Documentation Status
 
-In Zope3, "locations" are special objects that have a structural location.
+In Zope3, "locations" are special objects that have a structural
+location, indicated with ``__name__`` and ``__parent__`` attributes.
+
+See `zope.container <https://zopecontainer.readthedocs.io/en/latest>`_
+for a useful extension of this concept to "containers."
+
+Documentation is hosted at https://zopelocation.readthedocs.io/en/latest/