renamed participants module to users
renamed participants files to users files
changed all internal references to participants to users
First pass at adding demo11.jsp and demo11.html which gives examples of using the new BigBlueButton JavaScript API
Updates to bbb_api.jsp to pass along redirectClient=true for joinURL to load demo11.html
fix close cam if it's not available
Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton
Merge pull request #108 from SenecaCDOT-BigBlueButton/rename-participants-module

Rename participants module
Merge branch 'master' into upgrade-to-red5-r4597