feature API call to download repo archive
Created by: karlhungus
defaults to HEAD
Conflicts: spec/requests/api/repositories_spec.rb
Change-Id: Id114aca6c59d75f18e49bf9f33809a04e010bfb6
Created by: karlhungus
defaults to HEAD
Conflicts: spec/requests/api/repositories_spec.rb
Change-Id: Id114aca6c59d75f18e49bf9f33809a04e010bfb6