Allow setting options.command to override default
If options is a function, then it's a callback
Expand on comment for start vs. cmd on Windows.
exec to execFile
Make it work on Windows with spaces. Closes #1.
Thanks to @bogushevich for finding this bug, and the solution!
It turns out the new npmjs.org site doesn't update your readme when you force publish, so I guess I'll bump the version.