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)


If you use this approach and someone uses `setOnPageChangeListener()` then your internal `onPageSelected()` logic will be lost. It's better to make this listener to wrap another `OnPageChangeListener` that can be set using the public setter instead. Then in each `onPage*(...)` you can correctly invoke the external listener (if any), maintaining both yours and the "external" behaviour