this.cards = opts.cards;
this.cardClass = opts.cardClass || 'small';
this.colClass = opts.colClass || 'col s12 m4 l3';
var self = this;
this.on('mount', function(){
self.cards.forEach(function(e, i ){
e.br = (i && ((i+1) % 6 === 1));
});
self.update();
});