v1.4.4-candidate2

Let AsyncWriter know if the conn is closed already

v1.4.4-less-mem-alloc

Make the same changes to linux epoll.go

v1.4.4-candidate1

Make the queue generic with Writable interface

v1.4.4-cap-memory

make the same change to linux epoll.go

v1.4.4-dropped

make the same change to linux epoll.go