Notable changes buffer: Improve performance of Buffer allocation by ~11%. (Brian White) #10443 Improve performance of Buffer.from() by ~50%

Notable changes buffer: Improve performance of Buffer allocation by ~11%. (Brian White) #10443 Improve performance of Buffer.from() by ~50%. (Brian White) #10443 events: Improve performance of EventEmitter.once() by ~27%. (Brian White) #10445 fs: Allow passing Uint8Array to fs methods where Buffers are supported. (Anna Henningsen) #10382 http: Improve performance of http server by ~7%. (Brian White) #6533 npm: Upgrade to v4.0.5 (Kat Marchán) #10330