fixed using an exception when running with no accelerometer
fixed a null exception when a slide loads and a different view is active
rewrote the camera and mic management for the user

removed many duplicate files and renamed others so that they follow a
pattern
Merge branch 'master' into add-join-voice-button

Conflicts:
	src/org/bigbluebutton/model/User.as
fixed mute/unmute button and removed an event listener instead of adding again
Merge pull request #10 from bigbluebutton/add-join-voice-button

Add join voice button