- Adopted deferred WGI_VALUE design for Result type of *_parameter and similar functions

- Adopted the ITERATION_CURSOR [WGI_VALUE] design for *_parameters and similar functions
- renamed parameter as item
- provided helper function to handle "string" value parameters

Experimental for now.

library/server/ewsgi/specification/request/wgi_value.e

@@ -0,0 +1,48 @@
+note
+	description: "Summary description for {WGI_VALUE}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WGI_VALUE
+
+convert
+	as_string: {READABLE_STRING_32, STRING_32}
+
+feature -- Access
+
+	name: READABLE_STRING_GENERAL
+			-- Parameter name
+		deferred
+		end
+
+feature -- Helper
+
+	same_string (a_other: READABLE_STRING_GENERAL): BOOLEAN
+			-- Does `a_other' represent the same string as `Current'?	
+		deferred
+		end
+
+	is_case_insensitive_equal (a_other: READABLE_STRING_8): BOOLEAN
+			-- Does `a_other' represent the same case insensitive string as `Current'?	
+		deferred
+		end
+
+feature -- Query
+
+	as_string: STRING_32
+		deferred
+		end
+
+note
+	copyright: "2011-2011, 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