Log Message:
Update lang/nodejs to 7.4.0.

Notable changes

- buffer:
  - Improve performance of Buffer allocation by ~11%.
  - Improve performance of Buffer.from() by ~50%.
- events: Improve performance of EventEmitter.once() by ~27%.
- fs: Allow passing Uint8Array to fs methods where Buffers are supported.
- http: Improve performance of http server by ~7%.
- npm: Upgrade to v4.0.5