mopa-bootstrap collection.js fix

gistfile1.js

        // Indexes must be different for every Collection
        if(typeof this.options.index === 'undefined') {
            this.options.index = {};
        }
       // var elements = $('.collection-items');
        //console.log(elements.children().length);
        this.options.index[this.options.collection_id] = $('.collection-items').children().length;