Simulate: fixed charCode to be undefined unless specified. Fixed #3229 - Safari: jQuery.simulate() doesn't set "which" field for key events

(cherry picked from commit b90d83c)

Author: rdworth

tests/jquery.simulate.js

@@ -90,7 +90,7 @@ $.extend( $.simulate.prototype, {
 			shiftKey: false,
 			metaKey: false,
 			keyCode: 0,
-			charCode: 0
+			charCode: undefined
 		}, options );
 
 		if ( $.isFunction( document.createEvent ) ) {