Merge pull request #328 from thulka/master

Some lines that speed up event handling (20 to 18 % time spent) and make code cleaner.

src/Stage.js

@@ -308,13 +308,8 @@
 
             for (var n = 0; n < events.length; n++) {
               var pubEvent = events[n];
-                // induce scope
-                ( function() {
-                    var event = pubEvent;
-                    that.content.addEventListener(event, function(evt) {
-                        that['_' + event](evt);
-                    }, false);
-                }());
+              var f = that['_' + pubEvent];
+              that.content.addEventListener(pubEvent, f.bind(that), false);
             }
         },
         _mouseout: function(evt) {