Do not try to be smart for the user

Returns raw response instead of trying to tell to the user if the request succeed or not.
Indeed cups is not consistent. It might return OK even in case of failure.
speed up test execution
Merge pull request #62 from ticosax/always-return-raw-response

Always return raw response
Really fix #12
Merge pull request #63 from ticosax/fix-multi-value-fields

Really fix #12