code: function Client() {
  	this._host = '127.0.0.1'; // localhost
  	this._port = 4242; // default OpenTSDB port
  
  	// Output: (opinionated defaults)
  	this._ms = true;
  	this._arrays = true;
  	this._tsuids = false;
  	this._annotations = 'none'; // ["none","local","all"]
  
  	// Time:
  	this._start = null; // required
  	this._end = null;
  
  	// Queries:
  	this._queries = null; // required
  
  	// URL generator:
  	this._url = urlFactory( this );
  
  	return this;
  }
docs: CLIENT // 
  FUNCTION: Client()
  OpenTSDB query client constructor.
  
  @constructor
  @returns {Client} Client instance