Add a new property, SOUP_SESSION_IDLE_TIMEOUT, to specify a timeout after

Add a new property, SOUP_SESSION_IDLE_TIMEOUT, to specify a timeout after

	* libsoup/soup-session.c (soup_session_class_init): Add a new
	property, SOUP_SESSION_IDLE_TIMEOUT, to specify a timeout after
	which idle connections should be closed.
	(soup_session_get_connection): pass the idle_timeout value on to
	the connection.

	* libsoup/soup-connection.c (soup_connection_class_init): Add
	SOUP_CONNECTION_IDLE_TIMEOUT.
	(start_idle_timer, stop_idle_timer): add/remove a timeout to call
	soup_connection_disconnect().
	(socket_connect_result, soup_connection_connect_sync): start the
	idle timer after connection is complete
	(set_current_request): call stop_idle_timer() when starting a new
	request
	(clear_current_request): call start_idle_timer() when finishing a
	request
	(dispose): call stop_idle_timer() when destroying the connection

	#518214, based on a patch from Jorn Baayen.

svn path=/trunk/; revision=1112