Allow port in GRAPHITE_HOST (which is a URL, actually)
Log analyzer stats to graphite
Log roomba stats to graphite
Reduce log levels across the board

All the relevant stats are in graphite
Per-metric absolute value analysis
Send alerts in bulk

This will allow for more sensible aggregate reports
Also pass info about already alerted metrics

When we send a bulk message, we can include "this is still anomalous"
info cheaply
Push iteration over metrics to specific alerters

Right now the SMTP implementation is dumb but we'll get to that
Update docs
Short circuit notification path when no new alerts need sending
Send bulk mail notifications
Typo
Include sparklines of 20 last samples in email alerts