Revert 'presentation' dir to 0.81 code, add 'presentation2' for 0.9

This fixes an issue where recordings copied from a 0.81 server might
not play back correctly on a 0.9 server.

This changes the 0.9 recording scripts to use playback support files
from a different subdirectory, 'presentation2', while existing 0.81
recordings continue to use the 'presentation' directory.

If the raw files from an old recording are reprocessed, it will
switch to using the newer playback support files.
Use the directory presentation/0.9.0 instead of presentation2

This makes it a bit more obvious how the versioning can work going
forwards, and makes it so that we do not need to update the nginx
config each time we have a new version of the playback files.

The 0.81 files remain at the top level of the presentation directory
for compatibility reasons.
Move 0.81 files to a subdir, add nginx redirect for them.

Now the 0.81 presentation playback files are in an appropriate versioned
directory. If desired, the recording metadata can be updated to reference
the versioned files directly, but an nginx redirect has been added so
that unmodified recordings will also work.
Add a note to the nginx config to tell 0.9.0 beta users of a possible upgrade path
Merge pull request #412 from jfederico/master

bbb-lti: Addedd support for assigning the role of moderator to all users
added an additional fail case for the WebRTC audio
 - extracted the wrong boolean from the message which broke recording
 - add more loggig
 - update locales
Merge pull request #413 from SenecaCDOT-BigBlueButton/ice-failed-case

added an additional fail case for the WebRTC audio
Stop the webrtc timeout timer when 'connecting' is received
Merge pull request #414 from SenecaCDOT-BigBlueButton/additional-timeout-case

Stop the webrtc timeout timer when 'connecting' is received
 - add more logging
Merge branch 'master' of github.com:bigbluebutton/bigbluebutton
fix the record button tooltip when the locale is changed
added a check to make sure that ICE negotiation has finished before showing that the call has been accepted in the UI
Merge pull request #416 from SenecaCDOT-BigBlueButton/add-ICE-improvement

Update to ICE handling
Changed the wording of the webrtc messages to make them easier to understand
 - add more logging about the connection to red5
Merge pull request #418 from SenecaCDOT-BigBlueButton/webrtc-string-change

Changed the wording of the webrtc messages to make them easier to understand