unix: turn field stream->blocking into a flag

Saves 4 bytes.

Unix: namespace stream handle flags

unix: don't flush tty on switch to raw mode

Drain, don't flush the tty when switching from cooked to raw mode. Prevents
buffered keystrokes from getting lost. Switching back to cooked mo

unix: don't flush tty on switch to raw mode

Drain, don't flush the tty when switching from cooked to raw mode. Prevents
buffered keystrokes from getting lost. Switching back to cooked mode still
flushes.

Fixes joyent/node#2744.

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unix: fix segfault in uv_guess_handle()

Fixes #293.

UNIX: Loop on blocking streams

Also removes a superfluous syscall during uv_tty_init for writable TTY
streams.

Prepare for writable TTY to be blocking

add uv_tty_reset_mode()

unix: allow tty raw mode to be turned off

Fixes #76. Unify OS error reporting

As a nice fringe benefit, this also shaves a word
off of a windows TCP handle by replacing "uv_err_t
bind_error" with "int bind_error".

Remove uv_is_tty. Use uv_guess_handle instead.

added missing headers file

unix: add uv_guess_handle and uv_tty_get_winsize

unix: fix warning: implicit declaration of function ‘isatty’

Add uv_is_tty()

unix: implement uv_tty_set_mode

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.