Looking at the code, I believe this remark about `take(n)` computing partitions on the driver is no longer correct. Apologies if I'm wrong.

This came up in http://stackoverflow.com/q/28436559/3318517.

Author: Daniel Darabos <darabos.daniel@gmail.com>

Closes #4533 from darabos/patch-2 and squashes the following commits:

cc80f3a [Daniel Darabos] Remove outdated remark about take(n).