* support process.release
* support all io.js versions
* support node v4+ including new download locations
* enable delay-load hook by default by default
* download header-only tarballs instead of full source
See https://github.com/nodejs/node-gyp/pull/711 for full details
PR-URL: https://github.com/nodejs/node/pull/2700
Reviewed-By: Forrest L Norvell <forrest@npmjs.com>
