changed the publish window UI to be explicit that the user isn't sharing his video until he clicks on "Start transmission"
fix #782
The UI for transmitting audio and video have been redesigned as an attempt to improve the usability of those screens. In the video publish window, the button icon was replaced by text in order to make more explicit the fact that the user isn't transmitting until he clicks on the button (previous commit). In the audio settings window, a lot more text was added in order to help the users that are having difficulties.
Merge branch 'revisiting-ui-audio-video' into mconf-live0.3.2