Redesigned hooks system (moving from CMS_RESPONSE to CMS_API).

Indeed, hooks does not require RESPONSE interface,
   and should be setup before, at the system level (i.e CMS_API)
Added exportation solution via CMS_HOOK_EXPORT.
Updated blocks settings for demo example project.

src/hooks/export/cms_export_json_utilities.e

@@ -0,0 +1,35 @@
+note
+	description: "[
+			Usefull routines to export to JSON.
+		]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_EXPORT_JSON_UTILITIES
+
+feature -- Access
+
+	put_date_into_json (dt: detachable DATE_TIME; a_key: JSON_STRING; j: JSON_OBJECT)
+		local
+			hd: HTTP_DATE
+		do
+			if dt /= Void then
+				create hd.make_from_date_time (dt)
+				j.put_integer (hd.timestamp, a_key)
+			end
+		end
+
+	json_to_string (j: JSON_OBJECT): STRING
+		local
+			pp: JSON_PRETTY_STRING_VISITOR
+		do
+			create Result.make_empty
+			create pp.make (Result)
+			j.accept (pp)
+		end
+
+note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+end

src/hooks/export/cms_export_parameters.e

@@ -0,0 +1,43 @@
+note
+	description: "[
+			Parameters used by CMS_HOOK_EXPORT subscribers.
+		]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_EXPORT_PARAMETERS
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (a_location: PATH)
+		do
+			location := a_location
+			create logs.make (10)
+		end
+
+feature -- Access
+
+	location: PATH
+			-- Location of export folder.		
+
+feature -- Logs
+
+	logs: ARRAYED_LIST [READABLE_STRING_8]
+			-- Associated exportation logs.
+
+	log (m: READABLE_STRING_8)
+			-- Add message `m' into `logs'.
+		do
+			logs.force (m)
+		end
+
+invariant
+
+note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+end

src/hooks/export/cms_hook_export.e

@@ -0,0 +1,31 @@
+note
+	description: "[
+			CMS HOOK providing a way to export module data according to specific export parameters.
+		]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	CMS_HOOK_EXPORT
+
+inherit
+	CMS_HOOK
+
+feature -- Hook	
+
+	export_to (a_export_id_list: detachable ITERABLE [READABLE_STRING_GENERAL]; a_export_parameters: CMS_EXPORT_PARAMETERS; a_response: CMS_RESPONSE)
+			-- Export data identified by `a_export_id_list',
+			-- or export all data if `a_export_id_list' is Void.
+		deferred
+		end
+
+--	export_identifiers: detachable ITERABLE [READABLE_STRING_32]
+--			-- Optional list of exportation ids, if any.
+--		do
+--				-- To redefine if needed.
+--		end
+
+note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+end