Staged rendering for Requests table

Instead of rendering a monolithic table, it now:

* Deserialises data from API
* Filters & sorts the data in-memory
* Renders one chunk of the table
* If the user scrolls to the bottom, it renders another chunk
* If the user requests a filter or tries to sort the table, go to the second point again.

Also the table column width is fixed based on the widths of the first stage of rendering to improve performance.

The table should now be able to handle any amount of requests. The only thing that'd slow it down now is having too much data to deserialise. Currently on my Air it takes ~.3-.4s to process the 780ish Requests we have.

@tpetr @wsorenson 
You should save the result of this and cancel the previous one if set. Otherwise, you are still potentially queueing up hundreds of function calls (more info at [docs on `cancelAnimationFrame`](https://developer.mozilla.org/en-US/docs/Web/API/window.cancelAnimationFrame)).

```coffeescript
window.cancelAnimationFrame @previousScrollUpdate if @previousScrollUpdate?
@previousScrollUpdate = window.requestAnimationFrame @handleScroll
```

Also, I'm not sure what the latest needs for shimming `requestAnimationFrame` (and `cancelAnimationFrame`), but it is probably worth taking a quick peek at that (I know that at least IE9 [doesn't support `rAF`](http://caniuse.com/#feat=requestanimationframe))