Adds graceful shutdown extension to Colibri.
Adds Jirecon IQ provider.
Registers ColibriStatsExtension providers(to enable parsing).
Registers graceful shutdown IQ providers.
Does not override getChildElementXML when creating graceful shutdown error response.
Adds ColibriStatsIQ.

Conflicts:
	src/net/java/sip/communicator/impl/protocol/jabber/extensions/colibri/ColibriIQProvider.java
Adds parsing of SourcePacketExtension to ColibriIQProvider. Adds methods for copying AbstractPacketExtension and SourcePacketExtension..