Implemented Module enable/disable setting from configuration.

Implemented dependencies checking to set CMS_MODULE.is_enabled.
Implemented the persistence of CMS_USER.roles

modules/blog/cms_blog_module.e

@@ -32,6 +32,7 @@ feature {NONE} -- Initialization
 			version := "1.0"
 			description := "Service to demonstrate new node for blog"
 			package := "demo"
+			add_dependency ({CMS_NODE_MODULE})
 		end
 
 feature -- Access