Update lang/nodejs6 to 6.10.0.

Notable Changes

- crypto: allow adding extra certs to well-known CAs
- deps: Upgrade INTL ICU to version 58
- process: add process.memoryUsage.external
- src: add wrapper for process.emitWarning()
- fs: cache non-symlinks in realpathSync.
- repl: allow autocompletion for scoped packages

(fhajny)