Add method stopCallback evaluation

Author: kawabata_satoshi

mousetrap.js

@@ -982,6 +982,10 @@
             return false;
         }
 
+        return Mousetrap.stopCallbackElements(element);
+    };
+
+    Mousetrap.prototype.stopCallbackElements = function(element) {
         // stop for input, select, and textarea
         return element.tagName == 'INPUT' || element.tagName == 'SELECT' || element.tagName == 'TEXTAREA' || element.isContentEditable;
     };