Add all bids to the responses even if LOSS

- Provide to the exchange connector all the bids, including loss.
  Currently this is not possible, because the auction is discarding
  responses with price priority <= responses already received. This
  feature is important for us, because we are not handling winners, just
  doing optimizations for an specific request. The Winner will be
  handled by an external application.

- Removed a for loop to set LOSS for elements inside the response from
  the finish and setError methods. They are not needed, because we are
  always setting replaced responses in the Response list as LOSS.
Merge branch 'keep-all-bids' of https://github.com/dohse/rtbkit into dohse-keep-all-bids