Format /roomauth results

Old:
![](http://a.pomf.se/urnwkq.png)

New:
![](http://a.pomf.se/otrrqp.png)

Still not perfect, but certainly more legible.
We can dynamically generate `Config.groupsranking` by sorting by `.rank` (someone should make that happen if it hasn't already; @victini). Either way, `Config.groupsranking` is an array that should exist, so feel free to use it.