Apply prefix renaming from the specification

Reduced the number of EWSGI classes

library/server/ewsgi/src/request/gw_execution_variables.e

@@ -0,0 +1,56 @@
+note
+	description: "Summary description for {GW_EXECUTION_VARIABLES}."
+	legal: "See notice at end of class."
+	status: "See notice at end of class."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	GW_EXECUTION_VARIABLES
+
+inherit
+	EWSGI_VARIABLES [STRING_32]
+		undefine
+			copy, is_equal
+		end
+
+	HASH_TABLE [STRING_32, STRING]
+
+create
+	make
+
+feature -- Status report
+
+	variable (a_name: STRING): detachable STRING_32
+		do
+			Result := item (a_name)
+		end
+
+	has_variable (a_name: STRING): BOOLEAN
+		do
+			Result := has (a_name)
+		end
+
+feature {EWSGI_REQUEST, EWSGI_APPLICATION, EWSGI_CONNECTOR} -- Element change
+
+	set_variable (a_name: STRING; a_value: STRING_32)
+		do
+			force (a_value, a_name)
+		end
+
+	unset_variable (a_name: STRING)
+		do
+			remove (a_name)
+		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