Changes for Django 1.8.2

gracedb/models.py

migrations/auth/0002_alter_permission_name_max_length.py

migrations/auth/0003_alter_user_email_max_length.py

migrations/auth/0004_alter_user_username_opts.py

migrations/auth/0005_alter_user_last_login_null.py

migrations/auth/0006_require_contenttypes_0002.py