Avoiding InternalError by creating separate transaction when table is not yet created.
Merge branch 'feature/pathes/django-1.7-migrations' of github.com:pathes/django-sortedm2m
Make it possible to test with postgres DB by using a different settings file.
Adding postgres tests environemnts to tox.ini and using them in travis.
Fixing tests with postgres DB which does not reset the auto id increment back to 1 after a test.
Adding a Vagrantfile to ease the testing with postgres.