fix(events): include ie8 in extra event property reset

Author: mhevery

src/jqLite.js

@@ -514,8 +514,8 @@ function createEventHandler(element) {
 
     // Remove monkey-patched methods (IE),
     // as they would cause memory leaks in IE8.
-    if (msie < 8) {
-      // IE7 does not allow to delete property on native object
+    if (msie <= 8) {
+      // IE7/8 does not allow to delete property on native object
       event.preventDefault = null;
       event.stopPropagation = null;
       event.isDefaultPrevented = null;