fix a bug which cannot detecting file dependencies when include a nesting class

This patch will fix https://gist.github.com/4160705

lib/motion/project/builder.rb

@@ -677,6 +677,10 @@ PLIST
           @referred << name
         end
       end
+
+      def on_const_path_ref(parent, args)
+        on_var_ref(args)
+      end
     end
   end
 end; end