[Socket] Implement buffered async writing and closeAfterWriting
[Socket] Implement buffered async writing and closeAfterWriting

steverhoades/event-loop,mkrauser/event-loop,steverhoades/event-loop,kaduev13/event-loop,kaduev13/event-loop,mkrauser/event-loop,reactphp/event-loop,clue-labs/event-loop