bump version to 2.2.90. This will not be officially released, but once

bump version to 2.2.90. This will not be officially released, but once

	* configure.in: bump version to 2.2.90. This will not be
	officially released, but once these patches have gotten some
	testing they may be pulled up to the gnome-2-12 branch.

	* libsoup/soup-connection.c:
	* libsoup/soup-server.c:
	* libsoup/soup-session.c:
	* libsoup/soup-socket.c: add an "async-context" property,
	which gets passed from server to socket, and session to connection
	to socket, allowing async usage outside the main thread. Based on
	patches from Armin Bauer and Jürg Billeter.

	* libsoup/soup-misc.c (soup_add_io_watch, soup_add_idle,
	soup_add_timeout): utility routines to add watches, idles, and
	timeouts to non-default GMainContexts.

	* libsoup/soup-message-io.c (io_write): set the read state
	appropriately after writing a "100 Continue" response
	(io_read): More 100-Continue stuff. I don't think this is quite
	right so it will probably change again later.