Fixed bug that Listen only mode didn't work if the user didn't have a microphone connected. The problem was an unchecked null reference on microphone. fixes #765
Merge branch 'global-audio' of git://github.com/mconf/bigbluebutton into global-audio
Removed debug message
refactored some strings on en_US and pt_BR
Merge branch 'global-audio' into mconf-live0.3.1

Conflicts:
	bigbluebutton-client/locale/en_US/bbbResources.properties
	bigbluebutton-client/locale/pt_BR/bbbResources.properties