bin: use `stdio: 'inherit'` for child process spawn

Fixes deprecation warning in node v0.11.x:

  child_process: customFds option is deprecated, use stdio instead.
Merge pull request #1391 from TooTallNate/fix/v0.11.x-deprecation-warning

bin: use `stdio: 'inherit'` for child process spawn
Release 2.0.0