fix($animate): applyStyles from options on leave

missing <code>[options]</code> API that should either be removed from the docs or added in the code

@param {object=} options an optional collection of options that will be applied to the element.

the tests weren't working for this feature 
```javascript
      $animate.leave(element, 'off', {
        to: { color: 'blue' }
      });
      assertColor('blue'); //nothing should happen the element is gone anyway
```

you can view the docs here https://ng-click.com/$animate#leave