Log Message:
Updated libmicrohttpd to 0.9.55.

Add test targets, all tests pass for me.

Sun May 28 23:26:00 MSK 2017
	Releasing GNU libmicrohttpd 0.9.55. -EG

Sun May 21 18:48:00 MSK 2017
	Fixed build with disabled "UPGRADE".
	Fixed possible null-dereference in HTTPS test.
	Fixed compiler warning in process_request_body(), minor optimizations.
	Do not allow suspend of "upgraded" connections.
	Fixed returned value for MHD_CONNECTION_INFO_CONNECTION_SUSPENDED.
	Fixed removal from timeout lists of non-existing connections in
	cleanup_connection().
	Fixed double locking of mutex. -EG

Sun May 14 15:05:00 MSK 2017
	Fixed resuming connections and closing upgraded connections in select()
	mode with thread-per-connection. -EG

Sun May 14 14:49:00 MSK 2017
	Removed extra call to resume connections in MHD_run().
	Handle resumed connection without delay in epoll mode.
	Update states of resumed connection after resume in thread-per-connection
	mode.
	Fixed resuming connections and closing upgraded connections in poll()
	mode with thread-per-connection. -EG

Thu May 11 22:37:00 MSK 2017
	Faster start really processing data in resumed connections. -EG

Thu May 11 14:24:00 MSK 2017
	Do not add any "Connection" headers for "upgrade" \ 
connections. -EG

Wed May 10 23:09:00 MSK 2017
	Resume resuming connection before other processing in external polling
	mode. -EG

Tue May  9 23:16:00 MSK 2017
	Fixed: Do not add "Connection: Keep-Alive" header for "upgrade"
	connections. -EG

Tue May  9 21:01:00 MSK 2017
	Fixed: check all "Connection" headers of request for \ 
"Close" and "Upgrade"
	tokens instead of using only first "Connection" header with full string
	match. -EG

Tue May  9 12:28:00 MSK 2017
	Revert: continue match footers in MHD_get_response_header() for backward
	compatibility. -EG

Mon May  8 19:30:00 MSK 2017
	Fixed: use case-insensitive matching for header name in
	MHD_get_response_header(), match only headers (not footers). -EG

Fri May  5 20:57:00 MSK 2017
	Fixed null dereference when connection has "Upgrade" request and
	connection is not upgraded.  -JB/EG
	Better handle Keep-Alive/Close. -EG