Domain name in UserInformation

Domain name in User Information window. 

Screenshots:
![mumble-dev-domain-lan](https://cloud.githubusercontent.com/assets/521035/3423433/bf388ae8-ff96-11e3-9e38-16d07b2156e6.png)![mumble-dev-domain-hlds](https://cloud.githubusercontent.com/assets/521035/3423434/c16226d0-ff96-11e3-8cb3-6d702335a4eb.png)