Move host actions to action bar (#142)

Updated to the latest version of RoboGuice, removed some custom modules because I couldn't figure out how they work with the new version.. 
Added an action bar to the host information screen and moved all actions there.

This should be tested on Android 2.3, I don't have a device for that! 
In reality, feedback is for both directions - not just hosts. In fact, feedback for guests can be even more important. We ask all members to leave feedback for the other party after every hosting event. No biggie, but trying to move to "member" except where it really is exclusively "host".