unix, windows: make uv_cwd be consistent with uv_exepath

Fixes #446

Now working on v0.11.22

2014.02.28, Version 0.11.21 (Unstable)

Changes since version 0.11.20:

* unix: fix uv_fs_write when using an empty buffer (Saúl Ibarra
Corretgé)

* unix, windows: add a

2014.02.28, Version 0.11.21 (Unstable)

Changes since version 0.11.20:

* unix: fix uv_fs_write when using an empty buffer (Saúl Ibarra
Corretgé)

* unix, windows: add assertion in uv_loop_delete (Saúl Ibarra Corretgé)

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src: bump the version number

There was a bug in the libuv release tool where it didn't properly
update the proper version file.

unix, windows: add assertion in uv_loop_delete

unix: fix uv_fs_write when using an empty buffer

Now working on v0.11.21

2014.02.27, Version 0.11.20 (Unstable)

Changes since version 0.11.19:

* stream: start thread after assignments (Oguz Bastemur)

* fs: `uv__cloexec()` opened fd (Fedor Indutn

2014.02.27, Version 0.11.20 (Unstable)

Changes since version 0.11.19:

* stream: start thread after assignments (Oguz Bastemur)

* fs: `uv__cloexec()` opened fd (Fedor Indutny)

* gyp: qualify `library` variable (Fedor Indutny)

* unix, win: add uv_udp_set_multicast_interface() (Austin Foxley)

* unix: fix uv_tcp_nodelay return value in case of error (Saúl Ibarra
Corretgé)

* unix: call setgoups before calling setuid/setgid (Saúl Ibarra
Corretgé)

* include: mark close_cb field as private (Saúl Ibarra Corretgé)

* unix, windows: map EFBIG errno (Saúl Ibarra Corretgé)

* unix: correct error when calling uv_shutdown twice (Keno Fischer)

* windows: fix building on MinGW (Alex Crichton)

* windows: always initialize uv_process_t (Alex Crichton)

* include: expose libuv version in header files (Saúl Ibarra Corretgé)

* fs: vectored IO API for filesystem read/write (Benjamin Saunders)

* windows: freeze in uv_tcp_endgame (Alexis Campailla)

* sunos: handle rearm errors (Fedor Indutny)

* unix: use a heap for timers (Ben Noordhuis)

* linux: always deregister closing fds from epoll (Geoffry Song)

* linux: include grp.h for setgroups() (William Light)

* unix, windows: add uv_loop_init and uv_loop_close (Saúl Ibarra
Corretgé)

* unix, windows: add uv_getrusage() function (Oleg Efimov)

* win: minor error handle fix to uv_pipe_write_impl (Rasmus Pedersen)

* heap: fix node removal (Keno Fischer)

* win: fix C99/C++ comment (Rasmus Pedersen)

* fs: vectored IO API for filesystem read/write (Benjamin Saunders)

* unix, windows: add uv_pipe_getsockname (Saúl Ibarra Corretgé)

* unix, windows: map ENOPROTOOPT errno (Saúl Ibarra Corretgé)

* errno: add ETXTBSY (Fedor Indutny)

* fsevent: rename filename field to path (Saúl Ibarra Corretgé)

* unix, windows: add uv_fs_event_getpath (Saúl Ibarra Corretgé)

* unix, windows: add uv_fs_poll_getpath (Saúl Ibarra Corretgé)

* unix, windows: map ERANGE errno (Saúl Ibarra Corretgé)

* unix, windows: set required size on UV_ENOBUFS (Saúl Ibarra Corretgé)

* unix, windows: clarify what uv_stream_set_blocking does (Saúl Ibarra
Corretgé)

* fs: use preadv on Linux if available (Brian White)

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build, windows: do not fail on Windows SDK Prompt

fs: use preadv on Linux if available

build: fix compilation warning if dtrace doesn't work

Check if dtrace should instrument object files only if dtrace
support is detected to work

windows: fix typo

unix, windows: clarify what uv_stream_set_blocking does

Also replace the assert with an error on unix.

unix, windows: set required size on UV_ENOBUFS

When the supplied buffer is not big enough and UV_ENOBUFS is
returned, hint the user about the required size by setting
the len paramem

unix, windows: set required size on UV_ENOBUFS

When the supplied buffer is not big enough and UV_ENOBUFS is
returned, hint the user about the required size by setting
the len paramemeter to the required value.

Applies to:
- uv_pipe_getsockname
- uv_fs_event_getpath
- uv_fs_poll_getpath

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unix, windows: map ERANGE errno

This is a backport of 2f58bb6 from the master branch

unix, windows: map ERANGE errno

unix, windows: add uv_fs_poll_getpath

unix, windows: add uv_fs_event_getpath

fsevent: rename filename field to path

Also, it's now considered private.

test: fix compilation warning on non-linux systems

errno: map EFBIG, ENOPROTOOPT and ETXTBSY

This is a backport of:
https://github.com/joyent/libuv/commit/107be2bed38afa6279aa53b13b946eb60c204969
https://github.com/joyent/libuv/commi

errno: map EFBIG, ENOPROTOOPT and ETXTBSY

This is a backport of:
https://github.com/joyent/libuv/commit/107be2bed38afa6279aa53b13b946eb60c204969
https://github.com/joyent/libuv/commit/4a023fc0786780d254e1e4a34a983c36f59d99bf
https://github.com/joyent/libuv/commit/aaaefe32cadcfb26d07d625d17d7a2b8cafb4f2d

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test: fix compiler warning

errno: add ETXTBSY

Add `ETXTBSY` which could be returned by file system reads on some
unixes and emulate it with -148 (`ERROR_PATH_BUSY`) on windows.

test: fix compilation warning

unix, windows: map ENOPROTOOPT errno

Fixes #1143