[inspector] fill out radio pane

This gets us a pretty Radio panel with all the channels and their respective events, commands, and requests.
![](http://f.cl.ly/items/3N3i1n3g2s0Q3T0u0V2z/Image%202014-11-06%20at%2012.07.42%20PM.png)

I almost feel bad having y'all read this because like the other inspector PRs it's long and not all that interesting. You can imagine possible cleanup/refactors that extract common layout/list/row/info behaviors and base classes while you read it. Maybe we'll do this in the end, maybe we wont... Honestly, I kinda like looking at these semi-big views bc they're so easy on the eyes compared to all the agent code that's dense...
this fixes a bug where we wee accidentally trying to load `ui.html` or `radio.html`