Swipeableview spike

A simple view that will slide its children in.

**TODO** add touch events to drag the child in/out

![device-2014-06-29-135147 online-video-cutter com](https://cloud.githubusercontent.com/assets/1848238/3423295/a2cb1cbc-ff8d-11e3-8280-d3b0069e1125.gif)

I would be careful with this approach: basically you are requesting a layout on each frame of the animation, so you will encounter performance problems with anything more complex than the layout you are using in this test. A proper description of what you want to achieve will help anyone to understand better what you want to achieve, and perhaps discuss a better solution :)