upgrade to dropwizard 0.7.0-rc1

This is a completely incompatible update to dropwizard, hence the size of the
changes.

 - All of the `Environment` `add*` methods have be moved/replaced by
   `jersey()` and `admin()` etc
 - The configuration object is significantly change, hence changes to http.port
    have been change to either server.applicationConnectors[0].port or just replaced
    with logging.level