Use tox to support testing of several Django versions
Test Django1.5 and 1.6 support
RunDjangoTests command cleanup
Don't exit process after tox run

Use different messages for Django tests
More precise django test result descriptions
Reports for django tests overwrited another report
Reason of extra django tests run is documented
Merge pull request #337 from DXist/feature/multiple_django_versions

Feature/multiple django versions