Basic action bar added

Action bar added to all activities except login and signup. No styling yet, just got the base support added.

It uses android support library v7. I checked the library into git, you should just have to import the folder appcompat into your workspace and everything should work.

This new support library makes adding the action bar so easy! Until recently there was no support for action bar on pre Android 3 devices, and you had to use unofficial libraries to get it to work.