Ec2-ssh

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* Pip failed to receive wheel in version 1.5.0, re-uploading

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* Now using ``boto3``

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* ``ec2-ssh`` rewritten in Python. As part of this, the automatic 'pretty
prompt' has been removed.

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* Forked by YPlan
* Output from ec2-host is now in random order, allowing ec2-ssh to spread
logins between similar instances
* Python 3 compatibility

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* Fix issue when ec2-host finds one offline instance with same name as an online instance

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* Merged pull requests to add region and tag support