Allow Travis to not use YAML as the content type.
Allow Travis to not use YAML as the content type.

billinghamj/trunk.cocoapods.org,k0nserv/trunk.cocoapods.org,k0nserv/trunk.cocoapods.org,Shawn-WangDapeng/trunk.cocoapods.org,CocoaPods/trunk.cocoapods.org,CocoaPods/trunk.cocoapods.org,k0nserv/trunk.cocoapods.org,Shawn-WangDapeng/trunk.cocoapods.org,billinghamj/trunk.cocoapods.org