...finishes

Note this is dependent on https://github.com/apache/spark/pull/204 to have a working history server, but there are no code dependencies.

This also fixes SPARK-1288 yarn stable finishApplicationMaster incomplete. Since I was in there I made the diagnostic message be passed properly.

Author: Thomas Graves <tgraves@apache.org>

Closes #362 from tgravescs/SPARK-1408 and squashes the following commits:

ec89705 [Thomas Graves] Fix typo.
446122d [Thomas Graves] Make config yarn specific
f5d5373 [Thomas Graves] SPARK-1408 Modify Spark on Yarn to point to the history server when app finishes