Implemented WSF_RESPONSE.put_error (...) and related

Added WSF_RESPONSE.put_character
Renamed  WGI_OUTPUT_STREAM.put_character_8 as put_character  to follow style of put_string  (and not put_string_8)
Refactored the WSF_DEFAULT_SERVICE_LAUNCHER
Added WSF_DEFAULT_SERVICE to be more user friendly
Splitted the wsf/default/ libraries to have wsf/connector/... and being able to handle more than one connector in the same application

library/server/ewsgi/specification/response/wgi_response.e

@@ -96,6 +96,13 @@ feature -- Header output operation
 
 feature -- Output operation
 
+	put_character (c: CHARACTER_8)
+			-- Send the character `c'
+		require
+			message_writable: message_writable
+		deferred
+		end
+
 	put_string (s: READABLE_STRING_8)
 			-- Send the string `s'
 		require
@@ -115,6 +122,14 @@ feature -- Output operation
 		deferred
 		end
 
+feature -- Error reporting
+
+	put_error (a_message: READABLE_STRING_8)
+			-- Report error described by `a_message'
+			-- This might be used by the underlying connector
+		deferred
+		end
+
 note
 	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"

library/server/ewsgi/specification/stream/wgi_error_stream.e

@@ -0,0 +1,32 @@
+note
+	description : "[
+			Objects that represents the error stream
+		]"
+	specification: "EWSGI/connector specification https://github.com/Eiffel-World/Eiffel-Web-Framework/wiki/EWSGI-specification"
+	legal: "See notice at end of class."
+	status: "See notice at end of class."
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WGI_ERROR_STREAM
+
+feature -- Output
+
+	put_error (a_message: READABLE_STRING_8)
+			-- Report error described by `a_message'
+			-- This might be used by the underlying connector
+		deferred
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Eiffel Software 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

library/server/ewsgi/specification/stream/wgi_output_stream.e

@@ -37,13 +37,12 @@ feature -- Output
 			end
 		end
 
-	put_character_8 (c: CHARACTER_8)
+	put_character (c: CHARACTER_8)
 			-- Write `c' to output stream.
 			--| Could be redefined for optimization			
 		require
 			is_open_write: is_open_write
-		do
-			put_string (c.out)
+		deferred
 		end
 
 feature -- Specific output