Added tests for image radius parameter
Added tests for image radius parameter

contentful/contentful.objc,danieleggert/contentful.objc,akfreas/contentful.objc,akfreas/contentful.objc,danieleggert/contentful.objc,danieleggert/contentful.objc,davidmdavis/contentful.objc,contentful/contentful.objc,davidmdavis/contentful.objc,akfreas/contentful.objc,contentful/contentful.objc,davidmdavis/contentful.objc