code: function Connector (opts) {
    EventEmitter.call(this)
  
    opts = _.extend({
      networkName: 'livenet',
      concurrency: 10
    }, opts)
  
    this.networkName = opts.networkName
    this.concurrency = opts.concurrency
  
    this._nextReadyState = null
    this.readyState = this.READY_STATE.CLOSED
  }
docs: @event Connector#touchAddress
  @param {string} address
  @param {string} txid
   
  Abstract class for communication with remote service
  
  @class Connector
  @extends events.EventEmitter
  
  @param {Object} [opts]
  @param {string} [opts.networkName=livenet]
  @param {number} [opts.concurrency=0]