added debug denoting service map had serious error during creation before bubbling up the error to handleError.
Now using RawGet instead of Get to fetch keys in etcd.  This allows for introspection of response code.  Warn if response code is 404, indicating there are no serices running (or registrator isn't running Return an empty service map in this case and continue execution.  If there was no error, then unmarshall the response to a normal response and continue.