Change version number.

--HG--
branch : dev

Changed revision to 0.8.2.

Changed revision to 0.8.1.

Merged default and 0.8-dev for release of 0.8.

Removed tag 0.7.1

Added modifications to CHANGELOG

--HG--
branch : 0.7-dev

Added README.txt and description_full to setup.py.

merge

Moved to revision 0.4.1

Made some changes to the documentation to reflect most of the changes.