Fix imports that are incompatible with Django 1.6
Fix imports that are incompatible with Django 1.6
Handle custom user model in migration
Merge pull request #3 from fmr/fix/django_1_6

Fix imports that are incompatible with Django 1.6
Remove requirement for Oscar github repo
Add oscar version to install matrix
Update latest requirements and remove unused packages
Remove unused import from test
Extend the message type length
Use AUTH_USER_MODEL and AUTH_USER_MODEL_NAME from oscar.core.compat