Refactor persistence library.

Added a persistence speficication cluster and implementation cluser,
Implementation MySQL.
Added test cases for mysql implementation.

persistence/implementation/mysql/tests/application.e

@@ -0,0 +1,55 @@
+note
+	description : "tests application root class"
+	date        : "$Date: 2014-08-20 15:21:15 -0300 (mi., 20 ago. 2014) $"
+	revision    : "$Revision: 95678 $"
+
+class
+	APPLICATION
+
+inherit
+	ARGUMENTS
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make
+			-- Run application.
+		local
+			user: USER_DATA_PROVIDER
+			node: NODE_DATA_PROVIDER
+			l_security: SECURITY_PROVIDER
+		do
+			create connection.login_with_schema ("cms", "root", "")
+--			create user.make (connection)
+----			user.new_user ("jv", "test","test@test.com")
+
+--			if attached user.user (3) as l_user then
+--				if attached user.user_salt ("jv") as l_salt then
+--					create l_security
+--					if attached l_user.password as l_password then
+--						print (l_password)
+--						io.put_new_line
+--						print (l_security.password_hash ("test", l_salt))
+
+--						check same_string: l_security.password_hash ("test", l_salt).is_case_insensitive_equal (l_password) end
+--					end
+--				end
+--			end
+
+--			if attached user.user_by_name ("jv") as l_user then
+--				check l_user.id = 3 end
+--			end
+
+			create node.make (connection)
+			across node.recent_nodes (0, 5) as c loop
+				print (c.item)
+			end
+
+
+		end
+
+	connection: DATABASE_CONNECTION_MYSQL
+
+end