Updating models
Added django extensions module
Updated models to add ordering, string serialization and nullable fields
Admin pages vastly improved
Rest API working with new schema
Adding database diagram and utility script to re-generate the diagram
Updates to models.
Allowing token authentication via rest.

Fixing `db_multi` error when running tests
Updating git ignore
Updates to model and admin
Model update
Merge branch 'revising_models' of github.com:dhm116/ArchAngel-django into revising_models
Removing sqlite database from git
Merge branch 'Abdu' of github.com:dhm116/ArchAngel-django into revising_models
Multi-column primary keys are not supported. Fixing a few other model mistakes
Reverting course roster permission type from role to group to troubleshoot openshfit
Fixing AssignmentSubmission entry in admin.py
Fixing django exception if student group doesn't exist
Again, fixing the AssignmentSubmission admin view
Django 1.5 does not allow Debug=False along with an empty AllowHosts list