Add authFailureInterceptor service. Update angular

- I've updated AngularJS to 1.2 RC3
- I've added an authFailureInterceptor, which is based on the work by Pete Bacon Darwin on https://github.com/angular-app/angular-app/blob/master/client/src/common/security/interceptor.js
Add authRetryQueue
Fix regular expression
Fix REST API (Hyperlinking and permissions).

Fix permissions:
GET /api/users/ now returns a list of just one user for a normal user.
GET /api/users/ now returns a list of all users for an admin user.
APIs in /api/users/<userid>/... now work for <userid> *and* for admin user.

Fixed a problem with hyperlinking by updating Django-Rest-Framework.
Fix bug in previous commit
Use Hyperlinks for users inside REST API