message bus extracted, wanted to make sure the tests run regularly, so the new repo has travis enabled.

new home is https://github.com/SamSaffron/message_bus

implemented group support over there with testing fixes
Nuke message_bus_observer move to service class and classes
Secure all messages triggered by post creation and all user actions so they don't leak
(meaning, if you have a browser open and secure topics are created you will only get them if you are allowed to see them)