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/simple/application.e

@@ -0,0 +1,30 @@
+note
+	description : "simple application root class"
+	date        : "$Date$"
+	revision    : "$Revision$"
+
+class
+	APPLICATION
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make
+			-- Run application.
+		local
+			s: DEFAULT_SERVICE
+		do
+			create s.make_and_launch (agent execute)
+		end
+
+	execute (req: WSF_REQUEST; res: WSF_RESPONSE)
+		do
+			-- To send a response we need to setup, the status code and
+			-- the response headers.
+			res.write_header ({HTTP_STATUS_CODE}.ok, <<["Content-Type", "text/plain"], ["Content-Length", "11"]>>)
+			res.write_string ("Hello World")
+		end
+
+end

examples/simple/simple.ecf

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<system xmlns="http://www.eiffel.com/developers/xml/configuration-1-9-0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.eiffel.com/developers/xml/configuration-1-9-0 http://www.eiffel.com/developers/xml/configuration-1-9-0.xsd" name="simple" uuid="C28C4F53-9963-46C0-A080-8F13E94E7486">
+	<target name="simple">
+		<root class="APPLICATION" feature="make"/>
+		<option warning="true" is_attached_by_default="true" void_safety="all" syntax="transitional">
+			<assertions precondition="true" postcondition="true" check="true" invariant="true" loop="true" supplier_precondition="true"/>
+		</option>
+		<library name="base" location="$ISE_LIBRARY\library\base\base-safe.ecf"/>
+		<library name="default_nino" location="..\..\library\server\wsf\default\nino-safe.ecf"/>
+		<library name="http" location="..\..\library\protocol\http\http-safe.ecf"/>
+		<library name="wsf" location="..\..\library\server\wsf\wsf-safe.ecf"/>
+		<cluster name="simple" location=".\" recursive="true">
+			<file_rule>
+				<exclude>/EIFGENs$</exclude>
+				<exclude>/CVS$</exclude>
+				<exclude>/.svn$</exclude>
+			</file_rule>
+		</cluster>
+	</target>
+	<target name="simple_dotnet" extends="simple">
+		<setting name="msil_generation" value="true"/>
+	</target>
+</system>

examples/simple/simple.rc

@@ -0,0 +1 @@
+