Unit testing about mozdef HOT 4 CLOSED

We've added unit tests for alerts and for other key components of MozDef in #399 We will be enabling travisci very soon.

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We can find examples in official elasticsearch projects:

• https://github.com/elasticsearch/curator/tree/master/test_curator
• https://github.com/elasticsearch/elasticsearch-py/tree/master/test_elasticsearch

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I would be super cool to build docker on travis and have functional tests run on new commits.
Like ship some logs to mozdef, check that the transformations steps work, get them querying elasticsearch.

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Note: unit testing of alerts would also be a good thing

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