Fixed a inherit Stream API

```javascript
var context = require('rabbit.js').createContext('amqp://localhost:5672');
context.on('ready', function() {
  var sub = context.socket('SUB');
  sub.setEncoding('utf8');

  sub.connect('chat', function() {
    sub.on('data', function (message) {
      console.log('sub:', message)
    })
  });

  var sub2 = context.socket('SUB');
  sub2.setEncoding('utf8');

  sub2.connect('chat', function() {
    sub2.on('data', function (message) {
      console.log('sub2:', message)
    })

    sub2.emit('data', 'hello')
  });
});
```

$ node app.js
sub: hello
sub2: hello