Added CMS_STRING_EXPANDER.

For now with basic implementation.
  It will be improved later

Added SEO related attribute in CMS_RESPONSE.
Added improved Contact module.
Added basic SEO module.

modules/contact/src/persistence/contact_storage_sql.e

@@ -0,0 +1,49 @@
+note
+	description: "[
+			Contact message storage based on SQL statements.
+		]"
+	date: "$Date: 2015-02-13 13:08:13 +0100 (ven., 13 févr. 2015) $"
+	revision: "$Revision: 96616 $"
+
+class
+	CONTACT_STORAGE_SQL
+
+inherit
+	CMS_PROXY_STORAGE_SQL
+
+	CONTACT_STORAGE_I
+
+	CMS_STORAGE_SQL_I
+
+	REFACTORING_HELPER
+
+create
+	make
+
+feature -- Access	
+
+feature -- Change
+
+	save_contact_message (m: CONTACT_MESSAGE)
+		local
+			l_parameters: STRING_TABLE [detachable ANY]
+			now: DATE_TIME
+		do
+			create now.make_now_utc
+			error_handler.reset
+
+			write_information_log (generator + ".save_contact_message")
+			create l_parameters.make (9)
+			l_parameters.put (m, "message")
+			l_parameters.put (now, "changed")
+			sql_begin_transaction
+			sql_modify (sql_insert_contact_message, l_parameters)
+			sql_commit_transaction
+		end
+
+feature {NONE} -- Queries
+
+	sql_insert_contact_message: STRING = "INSERT INTO contact_messages (name, email, date, message) VALUES (:name, :email, :date, :message);"
+			-- SQL Insert to add a new contact message.
+
+end