SPARK-627 - reading --config argument
Merge branch 'master' of https://github.com/apache/incubator-spark

Updating local branch
Implementing --config argument in the scripts
SPARK-627 , Implementing --config arguments in the scripts
SPARK-627 , Implementing --config arguments in the scripts
Merge pull request #69 from KarthikTunga/master

Fix for issue SPARK-627. Implementing --config argument in the scripts.

This code fix is for issue SPARK-627. I added code to consider --config arguments in the scripts. In case the  <conf-dir> is not a directory the scripts exit. I removed the --hosts argument. It can be achieved by giving a different config directory. Let me know if an explicit --hosts argument is required.