Corrects writing DTMF payload (RFC4733) for RTP packets, when the RTP packet length is greater then the fixed header (i.e. with CSRC identifiers).

Adds SDES for XMPP. Works with Jingle and GTalk (only for gmail web app, doesn not work on "talk" for android).

Fixes an issue which would leak at least one Thread per call which would endlessly send out RTCP packets.

Commits an initial version of the libjitsi library which should be fully functional with respect to neomedia/MediaService and should be usable with and without OSGi.