Cfncluster

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* feature:``cfncluster``: Added s3_read_resource and s3_read_write_resource options to cluster config
* feature:``cfncluster``: cfncluster is now available in all regions
* updates:``ami``: Pulled latest CentOS errata
* feature:``cfncluster``: Added ephemeral_dir option to cluster config

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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