old_contents: 
  'use strict';
  
  module.exports = function() {
    // silence is golden
  };
  
new_contents: 
  'use strict';
  
  module.exports = function(options) {
    var ret = '';
  
    (this.allCards || []).forEach(function(c) {
      ret += options.fn(c);
    });
  
    return ret;
  };
  
subject: Add eachCard helper