Add interfaces for uv_pipe_open, uv_tty_init, uv_tty_set_mode

Nothing works - no tests. This is just to coordinate efforts between Bert
and I.

Remove uv_init from uv.h and windows backend

Subclass uv_getaddrinfo_t from uv_req_t.

This patch also fixes #155. Since we no longer
memset clear the uv_getaddrinfo_t, the user can
now set the `uv_getaddrinfo_t->data` field wit

Subclass uv_getaddrinfo_t from uv_req_t.

This patch also fixes #155. Since we no longer
memset clear the uv_getaddrinfo_t, the user can
now set the `uv_getaddrinfo_t->data` field without
problems.

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fs: add UV_ENOENT error code, add test

Add uv_fs_t.path on unix and tests

Windows implementation missing https://github.com/joyent/libuv/issues/177

windows: uv_fs_link + uv_fs_symlink

Specialize uv_xxx_getsockname, add uv_tcp_getpeername

docs for uv_fs methods

Move private headers into include/uv-private

win: multiplicity

bring back uv_init

unix: multiplicity

unix: implement uv_queue_work

Begin implementation of UNIX uv_fs_ functions

Adding this incomplete work now to ease rebase troubles later as it moves
the functions to src/unix/fs.c and introduces src/unix/internal.h.

add missing values to uv_fs_type

uv_fs & uv_work APIs

Simplify UDP docs

win: udp support

Add UDP support to libuv.

Make uv_getsockname() operate on uv_handle_t handles.

Fix 'incomplete prototype' compiler warnings on SunOS.

Remove trailing whitespace

Fix spelling

Add uv_buf_init() constructor

Improve docs