Add Python3 compatibility fixes, reference: #169
Add python 3 support for travis-ci
only run tests for django 1.5 and 1.6 on python 3
Merge pull request #172 from relekang/python3-compatibility

Only run tests for django 1.5 and 1.6 on python 3
Merge pull request #171 from mariocesar/python3-compatibility

Add Python3 compatibility, progress for #169
replace test images that return http error 403
Merge branch 'master' of github.com:mariocesar/sorl-thumbnail into tests