Caravan

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- Nothing changed yet.

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- Add a workflow demo (caravan.examples.demo)
- Changed Workflow api for defaults
- Support workflow default timeouts as type int

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- Add command caravan-domain-list
- Mock sys.argv rather than using a special argument

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- Switch to unittest + nose for tests
- Tested with Python 2.7, 3.3, 3.4, 3.5
- Don't force the AWS region to us-east-1

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- Allow workflows to raise an exception to fail an execution

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- Release again to fix PyPI upload server error