Error on send Result

[Kyoungju-Chin]

Hello.

I found some problem.
After I send c2dm msg with Valid and Invalid Token in very short time, then I check the Error response and OK response.
But, I found the result is Always Same.
The result shows same Errors or same Message ID.

I thought It occur the result 'sent' Event.
So I tested remove 'sent' event callback, and write cb directly.

remove #78
change #112 to if (cb) cb(operation.mainError(), null);
change #146 to if (cb) cb(error, id);

Then I finally get expected result.
Thanks.