Cfncluster

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* feature:``cfncluster``: Support for dedicated tenancy
* feature:``cfncluster``: Support for customer provided KMS keys (EBS and ephemeral)
* updates:``ami``: Pulled latest CentOS6 errata
* feature:``cfncluster``: Support for M4 instances

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* feature:``cfncluster``: Support for D2 instances
* updates:``ami``: Pulled latest CentOS6 errata
* updates:``ami``: Pulled latest cfncluster-node package
* updates:``ami``: Pulled latest ec2-udev-rules package
* updates:``ami``: Pulled latest NVIDIA driver 346.47
* updates:``ami``: Removed cfncluster-kernel repo and packages
* updates:``ami``: Updated Chef client to 12.2.1 + berkshelf

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* feature:``cli``: Added configure command; easy config setup
* updates:``docs``: Addtional documentation for configuration options
* updates:``ami``: Pulled latest CentOS6 errata
* bugfix:``cfncluster``: Fixed issue with nodewatcher not scaling down

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* updates:``ami``: Custom CentOS 6 kernel repo added, support for >32 vCPUs
* feature:``ami``: Chef 11.x client + berkshelf
* feature:``cfncluster``: Support for S3 based pre/post install scripts
* feature:``cfncluster``: Support for EBS shared directory variable
* feature:``cfncluster``: Support for C4 instances
* feature:``cfncluster``: Support for additional VPC security group
* updates:``ami``: Pulled latest NVIDIA driver 340.65
* feature:``cli``: Added support for version command
* updates:``cli``: Removed unimplemented stop command from CLI

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* updates:``ami``: Pulled latest CentOS errata. Now CentOS 6.6.
* updates:``ami``: Updated SGE to 8.1.6
* updates:``ami``: Updates openlava to latest pull from GitHub
* bugfix:``ami``: Fixed handling of HTTP(S) proxies
* feature:``ami``: Moved sqswatcher and nodewatcher into Python package cfncluster-node

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* feature:``cfncluster``: Support for GovCloud region
* updates:``cli``: Improved error messages parsing config file