Allow passing optiuons to API helper methods
Allow passing optiuons to API helper methods

To allow the apps to pass in things like credentials without the
constant names having to be baked in here.

theodi/gds-api-adapters,alphagov/gds-api-adapters,theodi/gds-api-adapters,bitzesty/gds-api-adapters,bitzesty/gds-api-adapters