merge down 0.2.0

* Unzip mongoid models to a model subdirectory. 
* Support user specified private keys
* Force region and availability zone to be the same
* Update launch scripts for workflow gem bundler
* Re-enable m2 generation machines because of larger volumes
* Allow uploading, shelling, and downloading from base OpenStudio::Aws Object
* Timestamp in JSON instance is now an integer (epoch time)
* GroupUUID is now an actual UUID instead of a timestamp in seconds (removes race condition when spinning up clusters in parallel)
* Changes to support upcoming aws-sdk-core version 2.0