unix: add TCP keepalive and no-delay control knobs

unix: fix file descriptor leak

unix: fix a few compiler warnings

Prepare for writable TTY to be blocking

unix: avoid unnecessary read() syscall

unix: clean up messy code

unix: return UV_UNKNOWN_HANDLE when read2 doesn't recv one

unix passes ipc test on this comment.

unix: handle passing kind of working

make test-ipc accept the pending tcp server

unix: implement uv_write2

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".

More tty on unix fixes

tty fixes for unix

unix: remove failed write requests from stream->write_queue_size

unix: pass error to write callback in stream cleanup

unix: fix off-by-one error in comparison

Only 3 of the 4 buffer list entries were being used.

unix: bring back uv__stream_destroy()

This is the revised version of reverted commit 431195c.

unix: handle stream write errors properly

1. Ensure that failed writes don't leave the write queue in an inconsistent
state. Before, write requests were handed back to the user but we

unix: handle stream write errors properly

1. Ensure that failed writes don't leave the write queue in an inconsistent
state. Before, write requests were handed back to the user but were not
removed from the write queue. The cause of at least one use-after-free bug.

2. Pass the error to the callback on the next iteration of the event loop
instead of returning it immediately.

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unix: fix argument check / write request init order

unix: remove unnecessary variable

unix: fix write queue double init

unix: deduplicate stream init logic

Move shared init logic into uv__stream_init().

unix: revert 98b9f58 and 431195c for now, corrupts memory

unix: run callbacks of pending writes when handle is closed

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