Now uses the iOS Category identifier
Android payload builder now puts contributor name in the title, not the body
Merge branch 'master' into mapi-493-add-ios-category-identifier
s/ApiClient/ContentApiClient/ to fix clash with notifications API client
Updated to CAPI client 3.5
Upgraded CAPI client 3.5 -> 3.7
Merge pull request #10 from guardian/mapi-493-add-ios-category-identifier

Now uses the iOS Category identifier