Timeouts are per-bucket, not per-contact.
Add a `libmemcached` build tag.
Reduce `notifyContact()` timeout.
Switch to Cap'n Proto for routing messages.
Router: Replace `io.Pipe()` with a buffer.
Revert to `io.Pipe()`.
Add `StoreSnapshots` to toggle metrics snapshots.

Closes #109.
Send stack traces to Heka.
Rewrite stack trace slicing for clarity.
Merge pull request #110 from mozilla-services/bug/routing-take-two

More routing fixes