For consistency with WebAPI where Json is registered before Xml
Comments: Fixed: http://aspnetwebstack.codeplex.com/SourceControl/changeset/45a571195394 http://aspnetwebstack.codeplex.com/SourceControl/changeset/eae75c4ce840
Comments: Fixed: http://aspnetwebstack.codeplex.com/SourceControl/changeset/45a571195394 http://aspnetwebstack.codeplex.com/SourceControl/changeset/eae75c4ce840