Enabled colorpicker

fixed bug 1716 - fixed an index out of bounds exception in repeatChatMessage

Related to issue #1710

Support pdf extension in uppercase https://code.google.com/p/bigbluebutton/issues/detail?id=1711

Re-enabling the common shortcut keys to change the slides

fixed an issue with keepToolbarVisible and an issue with the toolbar dissapearing when clicking the presentation window

Adding Start/Stop Recording feature

Conflicts:
	bigbluebutton-apps/src/main/java/org/bigbluebutton/conference/Room.java
	bigbluebutton-apps/src/main/java/org/bigbluebutton/conference/service/participants/ParticipantsEventSender.java
	bigbluebutton-apps/src/main/java/org/bigbluebutton/conference/service/recorder/participants/ParticipantsEventRecorder.java
	bigbluebutton-client/branding/default/style/css/BBBDefault.css
	bigbluebutton-client/src/org/bigbluebutton/main/model/users/UserService.as
	bigbluebutton-client/src/org/bigbluebutton/main/model/users/UsersSOService.as

bug could be easily reproduced typing text, erase part of it and then type again

Conflicts:
	bigbluebutton-client/branding/default/style/css/BBBDefault.css
	bigbluebutton-client/src/org/bigbluebutton/main/views/MainToolbar.mxml

Fix for issue #1656

Implemented lock settings in bbb-client and bbb-apps.

fixed an issue with keepToolbarVisible and an issue with the toolbar dissapearing when clicking the presentation window

Fix Persona URLs

added a check on presentation publish script to avoid the duplication of thumbnails for a given slide

fixing the issue of the whiteboard annotations not being shown in the proper slide; cleaning the environment (events.xml, recorded flag) when the session was recorded but the record button wasn't used