Support getting stats from Afterburner

[joehoyle]

If this is a drop in replacement for the PHP extension, is there a reason the hits and misses stats are not collected/available?

Good question, we could implement this. The object cache drop-ins are a bit all over the place in terms of what stats they collect.

[kovshenin]

For us I think it'd be useful to also know at what level the hits/misses are: runtime vs. local cache vs. remote.

[joehoyle]

I created https://github.com/humanmade/afterburner/issues/11 to track