Added support for mountpoints with underscores in the path (e.g. /mnt/backup_drive)
Uses a single UDP socket for forwaring all metrics
instead of creating a TCP connection for every
metric sent.

Note: UDP listener is off by default. To turn it on
modify carbon.conf like so:

    [cache]
    ENABLE_UDP_LISTENER = True
Treat sFlow-MEMCACHE mc_bytes as gauge rather than counter.
Merge pull request #102 from sflow/master

Treat sFlow-MEMCACHE mc_bytes as gauge, not counter.
Merge pull request #101 from satterly/feature/gmetad-carbon-udp

Forward metrics to Graphite using UDP carbon protocol
Merge pull request #100 from skemper/master

Add support for mounts on underscored paths