* configure.in (LT_*): add notes on how the libtool versioning
	works to save thinking. Increment soname to indicate protocol
	breakage (though really the library interface hasn't changed I
	guess)

	* dbus/dbus-transport.c (_dbus_transport_get_is_authenticated):
	verify the GUID received from server matches what we were
	expecting, if we had an expectation

	* dbus/dbus-auth.c (send_ok): send GUID along with the OK command
	(_dbus_auth_get_guid_from_server): new function
	(send_begin): parse the OK args

	* doc/dbus-specification.xml: add GUID to the auth protocol