Implemented Module enable/disable setting from configuration.

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

modules/oauth20/cms_oauth_20_module.e

@@ -49,7 +49,9 @@ feature {NONE} -- Initialization
 		do
 			version := "1.0"
 			description := "OAuth20 module"
-			package := "Oauth20"
+			package := "authentication"
+
+			add_dependency ({CMS_AUTHENTICATION_MODULE})
 
 			create root_dir.make_current
 			cache_duration := 0