Build a few simple end-to-end integration tests..

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We should build a few high level end-to-end integration tests with as few mocks as possible that simply test the overall behavior of the app. This will help prevent issues like #18.

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Initial integration tests should launch Zookeeper in the background (using the KazooTestHarness if possible), actually connect into Zookeeper, and handle the following scenarios.

• Watch a path with min_children 1...
  • Where 0 children exist
  • Where 1 child exists
  • Where 1 child exists, and then goes away (should alert)
  • Where >1 child exists, and then one goes away (should NOT alert)
• Watch a path with min_children 0...
  • Should NOT alert
  • Should be aware of all changes though
• Get a Dispatcher lock and ...
  • Ensure that it does alert
  • Ensure that if the Dispatcher lock is unavailable, does NOT alert