Fixing scrollbars

Hi guys, see these screenshots: 

![screenshot from 2013-10-11 11 31 07](https://f.cloud.github.com/assets/502164/1315272/6c279c70-3284-11e3-9ebc-2f0eba8f2915.png)

The left one is demo.bigbluebutton.org running v0.81rc3, while the right one is the patched version. If you use a small screen OR a normal size screen and a (not so) long copyright message, the scrollbars will appear and it will disturb the user experience. The modification will make the copyright message to get truncated, and also I've modified some other components that could be invisible but still were included in the layout, requiring more space in the UI.

Also as part of this patch I've fixed the issue #1609, that was too much simple to create a patch for it's own.

Unfortunately when I modified MainApplicationShell.mxml, my text editor fixed CR+LF of the file, so on GitHub compare it seems that there are a lot of modifications, while in fact there are just a few.