There are small typos in:
- docs/extensions/fenced_code_blocks.md
- docs/extensions/meta_data.md
- markdown/extensions/codehilite.py
- markdown/extensions/footnotes.py
- tests/test_legacy.py

Fixes:
- Should read `delimiters` rather than `deliminators`.
- Should read `shebang` rather than `sheband`.
- Should read `processing` rather than `proccesing`.
- Should read `backslash` rather than `blackslash`.

Signed-off-by: Tim Gates <tim.gates@iress.com>

Cleaned up the release notes.

* Add an extra option `lang_str` to pass the language of the code block
to the specified Pygments formatter.
* Include an example custom Pygments formatter in the documentation
that includes the language of the code in the output using the new option.

Resolves #1255.

This adds configuration support for using a custom Pygments formatter,
either by giving the string name, or a custom formatter class (or
callable).

Closes #1224

* footnotes: Allow to use backlink title without footnote number
- The placeholder '{}' is optional. So a user can choose to include or
not the footnote number in the backlink text.
- The modification is backward compatible with configurations using
the old '%d' placeholder.

* footnotes: Allow to use custom superscript text

- The addition of a new SUPERSCRIPT_TEXT option allows to specify
a placeholder receiving the footnote number for the superscript text.

This allows better interoperation with CSS style sheets, as the align
object on the TH is skipped if the css uses 'text-align: inherit' and
the previous 'text-align' is used instead (or the default: left).

Added an override to restore the original `align` behavior
Moved existing tests to the new test infrastructure
Added new tests to test the configuration parameter
Updated documentation to document the configuration parameter.