mesos/spark — pull request #599 by JoshRosen (2013-05-05 18:35:53+00:00)
Title: Fix SPARK-670: EC2 'start' command should require -i option.

This fixes [SPARK-670](https://spark-project.atlassian.net/browse/SPARK-670): "spark-ec2 should warn if you use the "start" command without passing a SSH key file".