Fix bug with subclass helper

dist/utils.js

@@ -38,14 +38,14 @@
 
   global.subclass = function(child, parent) {
     var ctor, key;
+    ctor = function() {
+      this.constructor = child;
+    };
     for (key in parent) {
       if (hasProp.call(parent, key)) {
         child[key] = parent[key];
       }
     }
-    ctor = function() {
-      return this.constructor = child;
-    };
     ctor.prototype = parent.prototype;
     child.prototype = new ctor();
     child.__super__ = parent.prototype;

src/utils.coffee

@@ -72,14 +72,16 @@ global.hasProp = {}.hasOwnProperty
 #
 # Returns subclass
 global.subclass = (child, parent) ->
+  ctor = ->
+    @constructor = child
+    return
+
   for key of parent
-    child[key] = parent[key] if hasProp.call(parent, key)
+    child[key] = parent[key]  if hasProp.call(parent, key)
 
-  ctor = -> @constructor = child
-
-  ctor.prototype = parent.prototype
-  child.prototype = new ctor()
-  child.__super__ = parent.prototype
+  ctor:: = parent::
+  child:: = new ctor()
+  child.__super__ = parent::
   child
 
 # Public: Function for instantiating a class with all passed arguments to