Swipeableview spike

A simple view that will slide its children in once.

![9xmvg](https://cloud.githubusercontent.com/assets/1848238/3424395/1a38b5e4-ffce-11e3-9193-d710db154fd9.gif)


I'm not sure I understand the purpose of this method. What it does is swallow the touch events if you the user swipes to the second page. But what if the user will swipe back? `canSwipe` does not seem to be reset anywhere. Is it the intended behaviour?