if the request headers contain an unrecognized Expect: header, return

if the request headers contain an unrecognized Expect: header, return

	* libsoup/soup-headers.c (soup_headers_parse_request): if the
	request headers contain an unrecognized Expect: header, return
	SOUP_STATUS_EXPECTATION_FAILED. Also, process Connection headers
	in HTTP/1.0 messages as required by 2616 14.10.
	(soup_headers_parse_response): Likewise handle Connection headers
	in HTTP/1.0 messages

	* tests/header-parsing.c: test those things

svn path=/trunk/; revision=1070