Make sure that submit event is still bound for regular form submit ev…

…ents. Thanks to Mark Gibson for the fix suggestion.

src/event.js

@@ -604,6 +604,9 @@ jQuery.event.special.submit = {
 					return trigger( "submit", this, arguments );
 				}
 			});
+
+		} else {
+			return false;
 		}
 	},