New, split out from soup-context and made into a GObject.

New, split out from soup-context and made into a GObject.

	* libsoup/soup-connection.c: New, split out from soup-context and
	made into a GObject.
	(soup_connection_disconnect): Disconnects the connection and emits
	a signal. (Replaces the old "keep_alive" flag.)
	(soup_connection_is_connected): Checks if the connection is still
	connected
	(connection_died): Just disconnect, rather than freeing the
	connection. This way if anyone else is still referencing it they
	won't end up with an invalid pointer.

	* libsoup/soup-context.c: Make this a GObject, remove all the
	SoupConnection code. Add an "ntlm_auths" field to SoupHost so that
	SoupContext can keep track of connection auth stuff there without
	SoupConnection needing to care. Various other updates.

	* libsoup/soup-private.h: Remove SoupContext and SoupConnection
	definitions.

	* libsoup/*.c, tests/get.c: Update for context/connection changes

	* libsoup/soup-socks.c (soup_connect_socks_proxy): Change the
	definition to deal with the fact that there's no
	soup_connection_get_context any more.

	* libsoup/soup-queue.c (soup_queue_read_headers_cb): Don't deal
	with connection persistence here.
	(soup_queue_read_done_cb): Do it here instead. Disconnect the
	connection when appropriate.
	(proxy_connect, proxy_https_connect, proxy_https_connect_cb):
	Reference-count the connection properly. (I think.)

	* libsoup/soup-marshal.list: New, for SoupConnection's
	"disconnected" signal.

	* libsoup/Makefile.am: add rules to build soup-marshal.[ch]

	* configure.in: Use AM_PATH_GLIB_2 rather than pkg-config, so that
	GLIB_GENMARSHAL gets set too.