support the full char set that graphite supports for metric names
support the full char set that graphite supports for metric names

raintank/metrictank,raintank/metrictank,replay/metrictank,raintank/metrictank,raintank/raintank-metric,replay/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,replay/metrictank,replay/metrictank