gn: Init at 0.0.0.20161008

This is the standalone version of GN used currently solely for building
Chromium. An upstream bug report is available at
https://crbug.com/504074

 to support a standalone build without needing
various components from the Chromium source tree.

Because there isn't a standalone vrsion available, I'm choosing
0.0.0.${date} as the version scheme here so that we don't conflict with
versioned releases from upstream someday[TM].

Signed-off-by: aszlig <aszlig@redmoonstudios.org>