* geis does not work with channels2 and never will be (it has to be python now)
* pytest
* rewrote cache system
* use username instead of pk for admin user in tests
Also fixt the case, where an anonymous user connects to the websocket connection.
Also added a function anonymous_is_enabled() to see, if the anyonmous user is enabled.
Added pip freeze to travis to see installed versions.
* Add caching support to users/group
* Add a function has_perm that works with the cache.
* Removed our session backend so other session backends (without the database) can be used
