first belle_sip implementation
first registration with authentication
multi proxy management
test both tcp and tls proxies
start sal sdp implementation
start incomming call implemention
implement useragent
implement sal_call_decline
First working version
implement call cancel/call reject
implements re-invite on belle-sip
implement text messaging
add missing file
implement presence
fix presence
test with pstn gateways
Merge remote-tracking branch 'public/master' into belle-sip

Conflicts:
	.cproject
	.project
	Makefile.am
	configure.ac
	coreapi/Makefile.am
	coreapi/callbacks.c
	coreapi/linphonecore.c
 partial fix for multiple dialog
add unsubscribe test
Merge remote-tracking branch 'public/master' into belle-sip