* Added basic support for end-to-end integration tests using WireMock, as well as a test for issue #1845
* HttpEngine now shuts down thread pool on termination.
* Made Netty thread pool accessible (and possible to shut down) in HttpEngine.
* Added awaitTermination to ActorSupport - in some cases, we have a race condition where shutdown code wasn't being called before services were restarted.
Merge pull request #1846 from jamespic/integration-testing

HTTP: Integration Testing