New layout and skin for bbb playback module.

Features:

• Full-width player controls locked to bottom of screen.
• New skin (css)
• Right side modules:
  • Chat
  • Download audio (currently .wav)
  • Share Link To Presentation (Email)
  • Credits
• Moved js code to a separate file

Installation:

Once BBB is installed on a server, these files go in: /var/bigbluebutton/playback/slides/