[Framework] Change cardinality of custom registrars

Change cardinality of custom registrars from one to
many; this will permit treating the service
compositor as a custom registrar. WTD-518.

platform/framework/src/register/CustomRegistrars.js

@@ -75,14 +75,22 @@ define(
                 }]);
             }
 
+            // Utility; create a function which converts another function
+            // (which acts on single objects) to one which acts upon arrays.
+            function mapUpon(func) {
+                return function(array) {
+                    return array.map(func);
+                };
+            }
+
             // More like key-value pairs than methods; key is the
             // name of the extension category to be handled, and the value
             // is the function which handles it.
             return {
-                routes: registerRoute,
-                directives: new CustomRegistrar("directive"),
-                controllers: new CustomRegistrar("controller"),
-                services: new CustomRegistrar("service")
+                routes: mapUpon(registerRoute),
+                directives: mapUpon(new CustomRegistrar("directive")),
+                controllers: mapUpon(new CustomRegistrar("controller")),
+                services: mapUpon(new CustomRegistrar("service"))
             };
         }
 

platform/framework/src/register/ExtensionRegistrar.js

@@ -91,7 +91,7 @@ define(
                     // code for services, directives, etc; otherwise,
                     // just register them under generic names.
                     if (customRegistrars[category]) {
-                        extensions.forEach(customRegistrars[category]);
+                        customRegistrars[category](extensions);
                     } else {
                         extensions.forEach(registerExtension);
                         registerExtensionArraysForCategory(category, names);