update to go1.6.1
update to go1.6.1

has a security fix
has a GC fix (i think)
may fix vendoring issue in circleci

replay/metrictank,raintank/metrictank,raintank/metrictank,OOM-Killer/metrictank,OOM-Killer/metrictank,replay/metrictank,raintank/raintank-metric,OOM-Killer/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric,replay/metrictank,raintank/raintank-metric,raintank/metrictank