fixes bug 858247 - Rate limiter on the public API
Merge pull request #342 from peterbe/bug858247-rate-limiter-on-the-public-api

fixes bug 858247 - Rate limiter on the public API
Added a commend about using the RatelimitMiddleware in case we ever decided to ratelimit other views.
fixes bug 866810 - favicon in django, r=lauraxt