[Framework] Fix partial constructor

Fix the replicated behavior of the new operator in the
partial constructor such that it accepts factory-style
constructors (which will be the norm according to
current code style standards.) WTD-518.

platform/framework/src/register/PartialConstructor.js

@@ -33,7 +33,11 @@ define(
                     var other = Array.prototype.slice.call(arguments),
                         instance = {};
 
-                    Constructor.apply(instance, dependencies.concat(other));
+                    // Mimic "new" behavior with apply.
+                    instance = Constructor.apply(
+                        instance,
+                        dependencies.concat(other)
+                    ) || instance;
                     instance.prototype = Constructor.prototype;
 
                     return instance;