Tox: use git urls and use dev version of feedgenerator for py2
Temporarily remove the version requirement for feedgenerator.

This is to avoid conflict with the git version. To be updated when a new version
of feedgenerator is released.
Update tests output for py3.3
Include feeds and mkd files in the dist package
Drop python 3.2 support and move to python 3.3.

Jinja 2.7 (released 2013-05-20) supports only Python3 >=3.3 so it is time to
drop Python 3.2 and move to 3.3