LearnBoost/socket.io-client — pull request #638 by j-salazar (2014-03-04 20:43:59+00:00)
Title: Let uri be optional when adding options for lookup()

So someone can go
```
var io = require('socket.io-client');
var socket = io({'reconnectionAttempts': 2});
```
and not wonder why his options didn't propagate.