Improving performances by removing Spacer component when possible, replacing them by style values and replacing boxes containers by canvases.
fix issue http://code.google.com/p/bigbluebutton/issues/detail?id=1609
related to exceptions when you try to log out of the session
handled the scrollbars that appear if you have a small screen and a (not so) long copyright message
 - when width of client is less than 800, hide the meeting name, shourtcut, and locale buttons.
Merge branch 'mconf-fixing-scrollbars'
Merge branch 'remove-spacers' of github.com:speakserve/bigbluebutton into speakserve-remove-spacers

Conflicts:
	bigbluebutton-client/src/org/bigbluebutton/modules/chat/views/ChatMessageRenderer.mxml
Merge branch 'master' of github.com:bigbluebutton/bigbluebutton
Merge branch 'master' into speakserve-remove-spacers