replace the http streaming ingest with a udp server
Merge pull request #45 from canaryio/udp-spike

Aggregate metrics via inbound UDP instead of streaming HTTP off of sensors
move to config via env instead of flags, update README
Merge pull request #46 from canaryio/get-config-from-env

Move to config via env instead of flags
if LIBRATO_SOURCE is not set, use the hostname instead
Merge pull request #47 from canaryio/use-hostname-as-librato-source

if LIBRATO_SOURCE is not set, use the hostname instead