Windows: better stat implementation

windows: map ERROR_ACCESS_DENIED to UV_EPERM

build: bump _WIN32_WINNT to 0x600

Commit b471b33 updated the Makefile, this commit updates the gyp file.

Update AUTHORS

Merge remote-tracking branch 'ry/v0.6'

uv.h: add EPERM to errno map to fix regression

EPERM isn't mapped in so chown returns an unknown error. This is a
regression from 0.4.12.

philips:node/ (master*) $ cat chown.js

uv.h: add EPERM to errno map to fix regression

EPERM isn't mapped in so chown returns an unknown error. This is a
regression from 0.4.12.

philips:node/ (master*) $ cat chown.js
var fs = require('fs')
fs.chown("/tmp/foobar", 100, 100, function(er){ console.log(er);})

philips:node/ (master*) $ ls -la /tmp/foobar
total 0
drwxr-xr-x 2 root wheel 68 Jan 24 17:21 .

0.4
---

philips:node/ (master*) $ /usr/local/Cellar/node/0.4.12/bin/node chown.js
{ stack: [Getter/Setter],
arguments: undefined,
type: undefined,
message: 'EPERM, Operation not permitted \'/tmp/foobar\'',
errno: 1,
code: 'EPERM',
path: '/tmp/foobar' }

master
------

philips:node/ (master*) $ ./node chown.js
{ [Error: UNKNOWN, unknown error '/tmp/foobar'] errno: -1, code: 'UNKNOWN', path: '/tmp/foobar' }

AFTER
-----

philips:node/ (master*) $ ./node chown.js
{ [Error: EPERM, operation not permitted '/tmp/foobar'] errno: 49, code: 'EPERM', path: '/tmp/foobar' }

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Implement udp multicast methods on windows

uv_udp_set_membership is not supported for UDP-IPv6 sockets yet.

Windows: enable SO_REUSEADDR for datagram sockets

test-multicast-join: don't attempt to bind to a multicast address

Does not work on Windows. Bind to a normal interface first, then join the
multicast group instead.

unix: explain SO_REUSEADDR and SO_REUSEPORT

test: add UDP broadcast/multicast/ttl tests

Windows: try to set up vc environment when not running from vs command prompt

test: fix up stream import/export test

unix: implement uv_import() and uv_export()

unix: add uv__dup()

test: fix undefined macro error

import/export streams accross loops

unix: add UNREACHABLE() macro

Asserts and aborts when program flow reaches a place it shouldn't.

unix: Remove assert in uv__pipe_accept

This assert unnecessarily prevents people from using the pipe_wrap
class in node to send file descriptors over sockets.

test: add windows-only uv_fs_stat regression test

windows: fix off-by-one error in uv_fs_stat

uv__is_root typo caused incorrect fs.exists results in Node.

sunos: fix uv_udp_set_ttl and uv_udp_set_multicast_loop

It turns out that setsockopt(IP_TTL) *does* expect an int, whereas
setsockopt(IP_MULTICAST_LOOP) needs a char.

sunos: fix uv_udp_set_ttl and uv_udp_multicast_ttl

The argument to setsockopt(IP_TTL|IP_MULTICAST_TTL) should be a char, not an int
like on other Unices.

Merge remote-tracking branch 'origin/v0.6'

test: add missing return statement in fs_stat_root