Fix for python 2.6, do not use dictionary comprehension
Renamed test files for new django1.6 test runner

https://docs.djangoproject.com/en/dev/releases/1.6/#new-test-runner
Added compatibility with python 3

1. Added compat file
2. Added __lt__ function to ImageMeta
3. Open file with 'rb' to avoid decode error in python3
Removed iteritems compat and used items
Workaround for sorting ImageMeta on the test, removed __lt__
Merge pull request #26 from SeiryuZ/fix-test

Fix test and added compatibility with python3