add interface and method to get generic collection
correct path
just check for 200
unmarshal into the given interface or return err
removed wrong one
update interface
update shoreline, mock for seagull
finish mocks - 2 legit to quit!
cater to 404 also
Merge pull request #6 from tidepool-org/jhbate/addToSeagull

Jhbate/add to seagull