Merge changes from Javier

- update on RESTbuck examples
- new example
- fixed bad typo in WSF_REQUEST

Reverted some changes such as
- http_client_response: keep the headers as a list to handle multiple message-value with same message-name

Fixed simple and simple_file example
Improved HTTP_HEADER

Changed libcurl implementation for http client
- now the header from the context really overwrite any of the session headers
- better design which is more strict, and remove any doubt about context's header usage

examples/restbucksCRUD/src/restbucks_server.e

@@ -0,0 +1,80 @@
+note
+	description : "Objects that ..."
+	author      : "$Author$"
+	date        : "$Date$"
+	revision    : "$Revision$"
+
+class
+	RESTBUCKS_SERVER
+
+inherit
+	ANY
+
+	URI_TEMPLATE_ROUTED_SERVICE
+
+	ROUTED_SERVICE_HELPER
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make
+		local
+			s: DEFAULT_SERVICE
+		do
+			initialize_router
+			create s.make_and_launch (agent execute)
+		end
+
+	create_router
+		do
+			create router.make (2)
+		end
+
+	setup_router
+		local
+			order_handler: ORDER_HANDLER [REQUEST_URI_TEMPLATE_HANDLER_CONTEXT]
+		do
+			create order_handler
+			router.map_with_request_methods ("/order", order_handler, <<"POST">>)
+			router.map_with_request_methods ("/order/{orderid}", order_handler, <<"GET", "DELETE", "PUT">>)
+		end
+
+feature -- Execution
+
+	execute_default (req: WSF_REQUEST; res: WSF_RESPONSE)
+			-- I'm using this method to handle the method not allowed response
+			-- in the case that the given uri does not have a corresponding http method
+			-- to handle it.
+		local
+			h : HTTP_HEADER
+			l_description : STRING
+			l_api_doc : STRING
+		do
+			if req.content_length_value > 0 then
+				req.input.read_string (req.content_length_value.as_integer_32)
+			end
+			create h.make
+			h.put_status ({HTTP_STATUS_CODE}.method_not_allowed)
+			h.put_content_type_text_plain
+			l_api_doc := "%NPlease check the API%NURI:/order METHOD: POST%NURI:/order/{orderid} METHOD: GET, PUT, DELETE%N"
+			l_description := req.request_method + req.request_uri + " is not allowed" + "%N" + l_api_doc
+			h.put_content_length (l_description.count)
+			h.put_current_date
+			res.set_status_code ({HTTP_STATUS_CODE}.method_not_allowed)
+			res.write_header_text (h.string)
+			res.write_string (l_description)
+		end
+
+note
+	copyright: "2011-2011, Javier Velilla and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+end