riemann.time: log exceptions using standard format.
Riemann.pool: correct exception logging.
Websocket server: better log messages for improper reqs.

When non-websocket requests arrive to a websocket server, log a message
to help users understand what's going on.
Merge branch 'master' of github.com:aphyr/riemann
riemann.core: index wrapper does pubsub in index/update now.

Deprecates update-index; since that's now handled by the index protocol
directly.