fix: https://code.google.com/p/bigbluebutton/issues/detail?id=1642

 - remove tracking of how many unread private tabs a user has as we don't really need that level of detail
   - fix: https://code.google.com/p/bigbluebutton/issues/detail?id=1640

   https://code.google.com/p/bigbluebutton/issues/detail?id=1641

Make generation of png images for pdf pages more resiliant.

We now use ghostscript to output pngs directly from the original pdf,
rather than using convert on the split pages. This should make corrupt
or strange pdfs less likely to cause issues.

As well, if a pdf page conversion fails (for any reason, including that
the original pdf is missing...) it will be logged, and a blank page
generated, and processing will continue.

fixes audio  extension problem in matterhorn

update locales

matterhorn scripts work with new version of ffmpeg

update bbb-record utility

Update locales

 - fix race condition where video share button doesn't show up somtimes when presenterShareOnly=true

removed the colour change from the chat item renderer and improved the layout when there's a long name

removed the colour change from the chat item renderer and improved the layout when there's a long name

added two strings in the log out window to locales

Logout URL was never called when API signOut call fail.

Fix chattab localization