const-ify stream argument to uv_is_readable() and uv_is_writable()

const-ify handle argument to uv_is_closing()

const-ify handle argument to uv_is_active()

test: don't assume unref'd timer cb runs

test: unlink UNIX socket before starting pipe echo server

test: remove unused variable

test: clean up test-stdio-over-pipes

test: make variables static in test-gethostbyname.c

test: stop counter_init from failing when watch_dir exists

windows: a closing async watcher should not call it's callback

test: fix a race condition in 'async' test

test: fix race conditions in test-async

windows: map ERROR_WRITE_PROTECT to UV_EROFS

unix: map `EROFS` to `UV_EROFS`

Fix spawn_and_kill_with_std test

Windows: make uv_dlopen() look in the DLL path to resolve recursive dependencies

Windows: make uv_uptime() more robust

Windows: validate UDP socket options

Makes test-udp-options pass on Windows.

unix: run pending shutdown cb when stream is closed

Disable ipc_send_recv_pipe test on Windows

It's not supported yet

Add UV_EIO error code

Whitespace

test: disable fs_event_close_in_callback on kqueue-based systems

Tests: don't use %zu placeholder in printf statements

It's not supported by msvcrt.

unix: fix udp_options test on OS X and Solaris

setsockopt(IP_TTL) will happily let you set a TTL > 255 on OS X, cap it.

-1 or 0 is a valid TTL on Linux but not portable, deny it.