[regression] added child-mixin (#1131)
[regression] added child-mixin (#1131)


bjornharrtell/ember-paper,miguelcobain/ember-paper,bjornharrtell/ember-paper,xomaczar/ember-paper,bjornharrtell/ember-paper,xomaczar/ember-paper,xomaczar/ember-paper,miguelcobain/ember-paper,miguelcobain/ember-paper