Fixed a problem with one of the test cases due to incorrect usage of our own DNS client
Removed some unnecessary code and ensured that set up hook only runs once
Added support for deleting via address (not exposed via API yet) and fixed unit tests accordingly
Removed unnecessary debug code
Exposed functionality via the API to delete a host based on its address, and implemented an integration test case for it
Fixes recommended by JsHint
Merge branch 'master' of https://github.com/oscarrenalias/nodens