code: function FilterStream(filterFunc, options) {
  	options = !options ? {} : options;
  
  	options.objectMode = true;
  	Transform.call(this, options);
  
  	this._filterFunc = filterFunc;
  }
docs: FilterStream runs a filter function on each chunk passed into it
  NOTE: objectMode will always be true for a batcher stream
  
  @param {Function} filterFunc - Function to filter results once
  @param {Boolean} filterFunc.chunk - Chunk/Object being passed through
  @param {String} encoding - Chunk encoding
  @param {Boolean} filterFunc.cb - Asynchronous callback for the filter function (if asynchronous)
  @param {Error} [filterFunc.cb.error] - Error from the filter
  @param {Boolean} [filterFunc.cb.result] - Result of the filter
  @param {Object} [options] - Stream options object