Yelp/mrjob — pull request #399 by irskep (2012-03-20 00:19:09+00:00)
Title: Fix testify dependency in mr_tower_of_powers and chmod on _poor_mans_scp

A couple of things while I was waiting for a job to run:

* remove testify calls from `mr_tower_of_powers`
* roll `_poor_mans_scp` back into `ssh_copy_key` to lessen confusion