@starsirius  => Add an API playground.

Makes the app management page(s) prettier and adds an API playground using Swagger.

![screenshot 2014-08-27 11 58 04](https://cloud.githubusercontent.com/assets/542335/4062835/f5b81c4c-2e02-11e4-9d9a-d830ab65c374.png)

Oh, and in terms of patterns, we have a [message](https://github.com/artsy/volt/blob/master/app/views/layouts/_messages.haml) in the layout in Volt and we can show/hide errors if necessary. It's a Rails flash message, and we could do similar things here with Bootstrap alerts.