Extend Fiber's Permission class with a new method, that checks if a user  is allowed to see the Fiber admin interface.
Only evaluate request's user attribute in the middleware if it exists.
Updated changelog to reflect the latest changes.
Bumped version numbers to 0.10.3.
Merge branch 'release/0.10.3'
Bumped version numbers to post-release.
Upgraded Django REST Framework to 2.3.6
Merge branch 'dev'
Bumped version numbers to 0.10.4
Merge branch 'master' into dev
Bumped version numbers to post-release