Add slideout events

[pazguille]

New Features

Now, an instance of Slideout can emit the following events:

• beforeclose
• close
• beforeopen
• open
• translate

The Slideout can emit translate event only when it is opening/closing via touch events.

slideout.on('translate', function(translated) {
  console.log(translated); // eg. 120 in px
});

Fixes

• Remove translate3d when slideout is closed.