Ploy-ec2

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* Fix confusion between instance from ploy and ec2 instance.
[fschulze]

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* Moved ``snapshots`` list command here after ploy enabled it.
[fschulze]

* Renamed mr.awsome to ploy and mr.awsome.ec2 to ploy_ec2.
[fschulze]

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* Renamed ``conn`` to ``ec2_conn`` to allow reuse of ``conn`` from BaseInstance.
[fschulze]

* Moved setuptools-git from setup.py to .travis.yml, it's only needed for
releases and testing.
[fschulze]

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* Initial release
[fschulze]