Picker does not close
I am not able to close the pickers I open by clicking outside the picker element.

This is because I have put the picker in a component which has `transform` applied to an ancestor. Therefore, the `cover` element in Picker, which has a `position: fixed` actually starts behaving like a `position: absolute` element (transforms change the container element of fixed-pos elements)

![screenshot 43](https://cloud.githubusercontent.com/assets/760112/12080442/26a2a2ac-b280-11e5-9742-c3b12e6ed584.png)
