Merge pull request #8 from klt39429/master

Added Changset Model with several find operations
adding simple tox configuration for py26,py27
adding 2.6 to travis-ci build
Merge remote-tracking branch 'origin/master'
adding py31,py32 to tox and travis
rolling back travis ci python3.1 as it does not support it...
updating README with new python versions, tox, and travis-ci documentation
Update README.rst
Update README.rst
Update README.rst
Update README.rst
Update README.rst
updating the setup.py to include dependencies and more meta info
adding test support for pypy