Fix connect URL with authentication.

Fix #13
How can I run testling?
Error occurs when I run testling at commit '1f9a6e0'.

setup
```
npm install -g testling phantomjs browserify
node /usr/local/lib/node_modules/testling/node_modules/browser-launcher/example/detect.js
```

run
```
browserify test.js | testling 
not ok 1 Error: ReferenceError: Can't find variable: describe on line 16718
``` 

or

```
testling
MOWS server started on port 13624

1..13
not ok 1 MqttClient specifying a port "before each" hook
  TypeError: 'undefined' is not a function (evaluating 'this.write.bind(this)')
      at WebsocketStream (http://localhost:59430/__testling?show=true:16298)
      at WebsocketStream (http://localhost:59430/__testling?show=true:16296)
      at buildWebsocket (http://localhost:59430/__testling?show=true:6706)
      at http://localhost:59430/__testling?show=true:6723
      at http://localhost:59430/__testling?show=true:6952
      at MqttClient (http://localhost:59430/__testling?show=true:6867)
      at http://localhost:59430/__testling?show=true:6726
      at http://localhost:59430/__testling?show=true:16681
      at http://localhost:59430/__testling?show=true:16657
      at http://localhost:59430/__testling/node_modules/mocha/mocha.js:4217
      at next (http://localhost:59430/__testling/node_modules/mocha/mocha.js:4490)
      at http://localhost:59430/__testling/node_modules/mocha/mocha.js:4494
      at timeslice (http://localhost:59430/__testling/node_modules/mocha/mocha.js:5487)
# tests 1
# pass 0
# fail 1
```
Any other setup is need?