Start moving over to new version of Content API
Update Content API to version 3.2
Add test files
Remove check for edition in ContentApiClient (I checked with Grant)
Fix outdated article test for keywords. (They now do not include section keywords.)
Fix issue where credit is repeated in caption
Merge branch 'master' into upgrade-content-api-client

Conflicts:
	common/app/model/package.scala
Merge pull request #6635 from guardian/upgrade-content-api-client

Upgrade Content API Client to 3.2