common: add UV_ENOSYS error code

win: make uv_process_kill(proc, 0) report process status

test: uv_process_kill(proc, 0) should not kill the process

add uv_udp_set_membership for unix multicast support

- test-udp-multicast-join tests that multicast packets can be received
- stub src/win/udp.c until support added

windows: don't alloc readdir buffer for empty dirs

fix mingw build

build: don't set CC and AR

Allows user to override compiler and archiver through the CC and AR environment
variables. Note that this already worked as expected with `make CC=clang`.

unix: stub kqueue support functions on old platforms

sunos: fix uv_spawn()

SunOS does not set POLLHUP when the read end of a pipe is closed.

sunos: link against libkstat

Prepare for writable TTY to be blocking

unix: don't alloc memory for readdir on empty dir

test: fix compiler warnings

Update features

windows: fixes crash in pipe.c

win: add error mappings for ECONNRESET

better docs

unix: IPC stdio stream should be duplex

windows: fixes #193. Ensures that uv_fs_event deals with short and long names

unix: avoid unnecessary read() syscall

fix fs_utime & fs_futime tests on windows

Dont build tests on 'make all'

unix: clean up messy code

Merge branch 'ipc2'

windows ipc fixes