Revert "Modified API to be able to map conferences by their name instead of their voiceBridge number. To preserve backwards compatibility is sufficient to pass the voiceBridge number as the conference name in the API call."

This reverts commit a7156aa0.

Command used: git revert a7156aa0

Conflicts:

	bigbluebutton-apps/src/main/java/org/bigbluebutton/conference/BigBlueButtonApplication.java

 - use external userID to match voice user. This way, third party apps can use the extern user id on the dialplan when calling from phone.

Conflicts:
	bigbluebutton-client/src/org/bigbluebutton/main/views/MicSettings.mxml

 - publish deskshare streams in the app context so that context isn't removed when last user disconnects