Squashed commit of the following:
commit 54de841112778b01e817e465d2f59840970bb4f3
Author: Robert Muir <rmuir@apache.org>
Date: Thu Dec 10 08:47:12 2015 -0500
see exactly how far MessyTestPlugin can go (unit tests depend on both groovy and mustache!)
commit 743b5a4e0cc9a05e307339dfcb4569feed31f337
Author: Robert Muir <rmuir@apache.org>
Date: Thu Dec 10 08:35:03 2015 -0500
fix x-pack compile/tests to work with https://github.com/elastic/elasticsearch/pull/15328
Original commit: elastic/x-pack-elasticsearch@4307bb163b
Robert Muir