Made hm.watchMethod() pass original arguments along to the interceptor.

Now you can log arguments of methods that are being watched, to see what's being called and how!

Example:
```javascript
var test = {
  method: function () {
    console.log('method called!');
    console.log(arguments);
  };
};

hm.watchMethod(test, 'method', function () {
  console.log('intercepted!');
  console.log(arguments);
});

test.method(1, 2, 3);
/*
 * Output:
 * intercepted!
 * [1, 2, 3]
 * method called!
 * [1, 2, 3]
 */
```