Fix imports that are incompatible with Django 1.6
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
Add AutoSlugField to TicketType and TicketStatus
Add data migration to populate slug fields
Add slug defaults
Add functions to get initial and resolved ticket statuses
Move ticket status generator to utils
Merge pull request #6 from fmr/fix/add_slug_fields

Add unique slug for TicketType and TicketStatus
Add unique constraint to slug instead of name
Merge pull request #7 from fmr/fix/add_slug_fields

Add unique constraint to slug instead of name