Merge pull request #6 from stanhu/master

Fix missing comma in documentation
Merge pull request #7 from stanhu/master

Handle missing fields in JWT payload
fix(docs): fix Keys name of `JWT_AUTH`

It removes invalid `DEFAULT_` prefixes from the keys for `JWT_AUTH`.

Ref: https://github.com/GetBlimp/django-rest-framework-jwt/blob/master/rest_framework_jwt/settings.py#L10-L24
Merge pull request #8 from theskumar/patch-1

fix(docs): fix Keys name of `JWT_AUTH`
Custom User model compatibility

From the docs: "Since the User model can be swapped out, you should use this method instead of referencing the username attribute directly."
Merge pull request #9 from spenthil/patch-1

Custom User model compatibility
Fix license in setup.py
Bump up version for release
Fix issue #11: Allow null e-mail addresses