Cfncluster

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* bugfix:``cfncluster``: Fix crash when base directory for config file
does not exist
* bugfix:``cfncluster``: Removed extraneous logging message at
cfncluster invocation, re-enabled logging in
~/.cfncluster/cfncluster-cli.log
* bugfix: ``cfncluster-node``: Fix scaling issues with CentOS 6 clusters caused
by incompatible dependencies.
* updates:``ami``: Update all base AMIs to latest patch levels
* updates:``cfncluster-cookbook``: Updated to cfncluster-cookbook-1.4.1

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* bugfix:``cfncluster``: Fix abort due to undefinied logger

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* change:``cfncluster``: `cfncluster stop` will terminate compute
instances, but not stop the master node.
* feature:``cfncluster``: CfnCluster no longer maintains a whitelist
of supported instance types, so new platforms are supported on day
of launch (including C5).
* bugfix:``cfncluster-cookbook``: Support for NVMe instance store
* updates:``ami``: Update all base AMIs to latest patch levels
* bugfix:``cfncluster-node``: Fixed long scaling times with SLURM

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* feature:``cfncluster``: Add support for r2.xlarge/t2.2xlarge,
x1.16xlarge, r4.*, f1.*, and i3.* instance types
* bugfix:``cfncluster``: Fix support for p2.2xlarge instance type
* feature:``cfncluster``: Add support for eu-west-2, us-east-2, and
ca-central-1 regions
* updates:``cfncluster-cookbook``: Updated to cfncluster-cookbook-1.3.2
* updates:``ami``: Update all base AMIs to latest patch levels
* updates:``cfncluster``: Moved to Apache 2.0 license
* updates:``cfncluster``: Support for Python 3

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* feature:``ami``: Added support for Ubuntu 16.04 LTS
* feature:``ami``: Added NVIDIA 361.42 driver
* feature:``ami``: Added CUDA 7.5
* feature:``cfncluster``: Added support for tags in cluster section in the config
* feature:``cfncluster``: Added support for stopping/starting a cluster
* bugfix:``cfncluster``: Setting DYNAMIC for placement group sanity check fixed
* bugfix:``cfncluster``: Support any type of script for pre/post install
* updates:``cfncluster-cookbook``: Updated to cfncluster-cookbook-1.3.0
* updates:``cfncluster``: Updated docs with more detailed CLI help
* updates:``cfncluster``: Updated docs with development environment setup
* updates:``ami``: Updated to Openlava 3.3.3
* updates:``ami``: Updated to Slurm 16-05-3-1
* updates:``ami``: Updated to Chef 12.13.30
* updates:``ami``: Update all base AMIs to latest patch levels

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* bugfix:``cfncluster-node``: Use strings in command for sqswatcher on Python 2.6
* updates:``ami``: Update all base AMIs to latest patch levels