Node support

[3rd-Eden]

Added nodejs support for the client, based on the work of pull req #240

Passes simple test:

var connect = require('connect')
  , app = connect.createServer(connect.static(__dirname))
  , io = require('../../socket.io').listen(app);

io.sockets.on('connection', function (socket) {
  var messages = [];

  socket.on('print', function (msg) {
    if (messages.indexOf(msg) >= 0) {
      console.error('duplicate message', msg);
    }

    messages.push(msg);
    if (messages.length == 2) {
      socket.emit('done');
    }
  });
});

app.listen(8080);

var client = require('../lib/io');

setTimeout(function () {
  var socket = client.connect('http://localhost:8080/')
  socket.on('connect', function () {
    socket.emit('print', 'foo');
    socket.emit('print', 'bar');
  });

  socket.on('connecting', function (transport) {
    console.log('Trying to connect using ' + transport);
  });

  socket.on('disconnect', function () {
    console.log('Aww, disconnected');
  });

  socket.on('reconnecting', function (delay, attempt) {
    console.log('reconnecting, attempt #' + attempt);
  });

  socket.on('reconnect', function () {
    console.log('reconnected <3');
  });

  socket.on('done', function () {
    console.log('done!');
    socket.disconnect();

    process.exit(1);
  });
}, 2000);

[bewa]

Good Job!