Improve kick

Kick, ban etc are now all slightly nicer.  If you're kicked, you get told in a popup notification.  If you're banned, same.  Reasons are supported for both kick and ban.  Users in rooms get notified of other users being kicked/banned (and by who, and if there's a reason, what that is)
![croppercapture 6](https://cloud.githubusercontent.com/assets/1271535/3488705/22728d6e-04fd-11e4-9e5f-ff11716906cc.jpg)
![croppercapture 7](https://cloud.githubusercontent.com/assets/1271535/3488706/22965960-04fd-11e4-9b57-4d7f2c64235b.jpg)
![croppercapture 8](https://cloud.githubusercontent.com/assets/1271535/3488707/229ceaaa-04fd-11e4-943b-bd6c7acbcae5.jpg)