Added conditional GET support (HTTP caching) to FeedsController#index action, but only when listing all subscribed feeds.
Added conditional GET support (HTTP caching) to FeedsController#index action, but only when listing all subscribed feeds.

HTTP caching when listing all feeds in a folder is not yet implemented.

HTTP caching uses only the last-modified header (no etag), and it's based on the subscriptions_updated_at attribute of the current user.

jmwenda/feedbunch,amatriain/feedbunch,jmwenda/feedbunch,amatriain/feedbunch,amatriain/feedbunch,amatriain/feedbunch,jmwenda/feedbunch