kortschak's fix
lock s.kill, send done signal
Import gremlin, v=2 for more cases
Merge branch 'master' into replcrash
Merge pull request #125 from barakmich/gremlin_underscore

Import underscore for Gremlin
Merge pull request #126 from barakmich/replcrash

Temporarily fix REPL crash by locking the kill channel
Switch default to localhost. Fixes #107
Merge pull request #127 from barakmich/localhost

Switch default to localhost. Fixes #107