implemented the startup application with a consistent UI, avoiding the standard flex colors while the client doesn't load the branding file
Merge branch 'white-startup' of github.com:mconftec/bigbluebutton into 090-white-startup

Conflicts:
	bigbluebutton-client/src/BigBlueButton.mxml
Merge branch '090-white-startup' into mconf-live0.6.1

Conflicts:
	bigbluebutton-client/src/org/bigbluebutton/main/views/MainApplicationShell.mxml
better vertical align of the logo
Merge branch '090-branding-logo' into mconf-live0.6.1

Conflicts:
	bigbluebutton-client/src/org/bigbluebutton/main/views/MainApplicationShell.mxml