nodeExecTask doesn't assume __dirname location

[JasonGore]

nodeExecTask didn't assume __dirname when invoking a relative script, which forced me to do:

  task('wacbuild', nodeExecTask({
    enableTypeScript: true,
    args: [path.join(__dirname, './wacBuildRun.ts')]
  }));

I'm not exactly sure if this is an issue, but it doesn't feel quite so ergonomic. I wonder if nodeExecTask should take a specific script path or task function rather than bare node args? Hmm.