code: function loadObject(data, db, callback) {
      callback = callback || function() {};
      var iterator = function(modelName, next){
          insertCollection(modelName, data[modelName], db, next);
      };
      async.forEachSeries(Object.keys(data), iterator, callback);
  }
docs: Loads fixtures from object data
  
  @param {Object}      The data to load, keyed by the Mongoose model name e.g.:
  { User: [{name: 'Alex'}, {name: 'Bob'}] }
  @param {Connection}  The mongoose connection to use
  @param {Function}    Callback