Notification for secondary click on selected token

I've been using JSTokenField for my app and it's been great.  I wanted to add a behavior similar to iPhone's Mail app.

In Mail app, a token is selected when you tap one of them in To field.  This behavior is in JSTokenField.  When you tap already selected token, it shows detail info view.  

I've implemented it by introducing `JSTokenFieldTokenSecondTapNotification`.

It would be great if I can do something like Mail app does.  I'm happy to make changes, so please advise.

Thanks,
-gaku