Flick element - make flick work with sliders

DISCUSSION: @admc @jlipps @sourishkrout

As UI elements in the iOS are pretty standard it might be a good idea to make standard bindings for them 

For example:
  - UIStepper - increment ('tap +'), decrement ('tap -')
  - UIASlider - 'set to 10%', 'set to 90%'  - in docs this object has method 'dragToValue' which we could use - http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Reference/UIASliderClassReference/UIASlider/UIASlider.html 

![Screen Shot 2013-01-24 at 13 02 03](https://f.cloud.github.com/assets/778717/93353/ee82a978-661d-11e2-8798-5c157e3ad6ae.png)

If we won't do this on our side, devs will have to produce some workarounds. I'm not sure how to accomodate that inside JSON Wire protocol..