Log Message:
Update to 0.12

Also use ALTERNATIVES framework to allow concurrent installation under
multiple pythons.

Release 0.12 (2014-07-06)
=========================

* docs/ref/rst/directives.txt
  - Update "math" and "csv-table" descriptions.

* docutils/parsers/rst/directives/images.py
  - Fix [258] figwidth="image" generates unitless width value.

* docutils/parsers/rst/states.py
  - Improve error report when a non-ASCII character is specified as
    delimiter, quote or escape character under Python 2.
    Fixes [ 249 ] and [ 250 ].

* docutils/writers/html4css1/__init__.py
  - Don't add newline after inline math.
    Thanks to Yury G. Kudryashov for the patch.

* docutils/writers/latex2e/__init__.py
  - Fix [ 239 ] Latex writer glues paragraphs with figure floats.
  - Apply [ 116 ] by Kirill Smelkov. Don't hardcode \large for subtitle.

* docutils/writers/odf_odt/__init__.py
  - Apply patch by Jakub Wilk to fix bug [ 100 ].

* test/test_error_reporting.py
  - Fix [ 223 ] by removing redundant tests we do not have control over.

* test/test_nodes.py
  - Apply [ 115 ] respect fixed 2to3 string literal conversion behavior.