Replace socket.io client event for test

ex.coffee

socket = new Socket()
socket.emit 'config', 
  id: 123

socket.on 'message', (message) =>
  receiveMessage message

socketioclient.test.coffee

  class EventEmitter
      events: {}
      on: (event, callback) -> @events[event] = callback
      emit: (event, data) -> @events[event](data) if @events[event]

  class Socket extends EventEmitter