Introduces a REST public API to Videobridge (in addition to the XMPP public API).
Adds examples and describes the user-configuration availability of the HTTP/JSON API of Jitsi Videobridge.
Refactor code common for both RtpChannel and SctpConnection. Adjusts to DtlsControl changes.
Merge branch 'master' into sctp_data_channels

Conflicts:
	src/org/jitsi/videobridge/Channel.java
	src/org/jitsi/videobridge/ComponentImpl.java
	src/org/jitsi/videobridge/Conference.java
	src/org/jitsi/videobridge/Content.java
	src/org/jitsi/videobridge/IceUdpTransportManager.java
	src/org/jitsi/videobridge/TransportManager.java