Don't warn about missing STDIN for --config until 1s has elapsed.
Bump fs.MAX_OPEN limit now that graceful-fs knows about more open files.

Version 2.0.0 of graceful-fs went back to monkey-patching the fs module,
which allows it to intercept more fs operations and thereby control the
maximum number of open files more tightly:
https://github.com/isaacs/node-graceful-fs/commit/b07cc4518d