Provide a look into the chache #12

That's the current state of my view into the cache. Both, HTML, JSON and CSV formats are available. It's far from perfect, but better than nothing at all.

Before I continue, I want to check if this is going into the right direction.

I think what you've done here is great! We could reuse this in yarnd as well (with some modifications) for a view into the feeds the cache fetches on behalf of users and surface dead feeds and cleanup (at least) my pod that has so much rubbish in it :)

 			l = append(l, func(i, j int) bool { return urls[i].DiscoveredAt.Before(urls[j].DiscoveredAt) })
 		case "-discovered":
 			l = append(l, func(i, j int) bool { return urls[i].DiscoveredAt.After(urls[j].DiscoveredAt) })
 		case "scaped":

Provide a look into the chache #12

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