Toggle help bubble message between Mute and Unmute microphone
Checking with hasClass method is prefered because it is more resillient to UX changes
Test that the title of the microphone mute button changes
Restructured the test file to give each test fresh fixtures and clean
them up afterwards + remove workaround
Break too long line
Merge pull request #307 from bgdnc/Toggle-mute-and-unmute-microphone-message

Toggle help bubble message between Mute and Unmute microphone, r=@dmose.  Thanks for the patch!