explain logging and weight fixing
Fix linksto and zero-costs
kortschak's fix
lock s.kill, send done signal
fix the tests and care not about result ordering
Merge pull request #122 from barakmich/explain

Explain Level Logging and Correcting the Cost Model
Merge branch 'master' into boltdb
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
Merge branch 'master' into boltdb