Drf-authentify

Fixes:
- Fix pypi unexisting document

Fixes:
- Fix error in TokenAuthentication class' authenticate method (accidentally forgot to update this after method authentication_header was changed).

Fixes:
- Fix error in Auth class' authentication_header method.

Features:
- Add new setting configuration "ENABLE_AUTH_RESTRICTION" to allow users enable/disable channel restrictions.

Fixes:
- Auth classes no longer raise errors on failure, this function will now be left to DRF permission classes.
- Update AuthToken private method __generate_token to return token string not token instance.

Fixes:
- Token auth class checking wrong condition in authenticate_header method.

Fixes:
- auth class accessing wrong method
- update authenticate_header on auth classes