Aws-parallelcluster

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- feature:``cfncluster``: Added support for new T2 instances
- updates:``cfncluster``: Changed default instance sizes to t2.micro(free tier)
- updates:``cfncluster``: Changed EBS volume default size to 20GB(free tier)
- updates:``ami``: Pulled latest CentOS errata
- bugfix:``cfncluster``: Fixed issues with install_type option(removed)

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- feature:``cfncluster``: Added option to encrypt ephemeral drives with in-memory keys
- feature:``cfncluster``: Support for EBS encryption on /shared volume
- feature:``cfncluster``: Detect all ephemeral drives, stripe and mount as /scratch
- feature:``cfncluster``: Support for placement groups
- feature:``cfncluster``: Support for cluster placement logic. Can either be cluster or compute.
- feature:``cfncluster``: Added option to provides arguments to pre/post install scripts
- feature:``cfncluster``: Added DKMS support for Lustre filesystems - http://zfsonlinux.org/lustre.html
- bugfix:``cli``: Added missing support from SSH from CIDR range
- bugfix:``cfncluster``: Fixed Ganglia setup for ComputeFleet
- updates:``SGE``: Updated to 8.1.7 - https://arc.liv.ac.uk/trac/SGE
- updates:``Openlava``: Updated to latest Git for Openlava 2.2 - https://github.com/openlava/openlava

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- feature:Amazon EBS: Added support for Amazon EBS General Pupose(SSD) Volumes; both AMI and /shared
- bugfix:``cli``: Fixed boto.exception.NoAuthHandlerFound when using credentials in config
- updates:CentOS: Pulled in latest errata to AMI. See amis.txt for latest ID's.

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- Release on GitHub and PyPi