stream: unshift('') is a noop

In some cases, the http CONNECT/Upgrade API is unshifting an empty
bodyHead buffer onto the socket.

Normally, stream.unshift(chunk) does not set state.reading=false.
However, this check was not being done for the case when the chunk was
empty (either `''` or `Buffer(0)`), and as a result, it was causing the
socket to think that a read had completed, and to stop providing data.

This bug is not limited to http or web sockets, but rather would affect
any parser that unshifts data back onto the source stream without being
very careful to never unshift an empty chunk.  Since the intent of
unshift is to *not* change the state.reading property, this is a bug.

Fixes #5557
Fixes LearnBoost/socket.io#1242
url: Properly parse certain oddly formed urls

In cases where there are multiple @-chars in a url, Node currently
parses the hostname and auth sections differently than web browsers.

This part of the bug is serious, and should be landed in v0.10, and
also ported to v0.8, and releases made as soon as possible.

The less serious issue is that there are many other sorts of malformed
urls which Node either accepts when it should reject, or interprets
differently than web browsers.  For example, `http://a.com*foo` is
interpreted by Node like `http://a.com/*foo` when web browsers treat
this as `http://a.com%3Bfoo/`.

In general, *only* the `hostEndingChars` should be the characters that
delimit the host portion of the URL.  Most of the current `nonHostChars`
that appear in the hostname should be escaped, but some of them (such as
`;` and `%` when it does not introduce a hex pair) should raise an
error.

We need to have a broader discussion about whether it's best to throw in
these cases, and potentially break extant programs, or return an object
that has every field set to `null` so that any attempt to read the
hostname/auth/etc. will appear to be empty.
url: Set href to null by default
blog: Release v0.10.9
blog: Release v0.8.24
blog: 0.8 is maintenace, not stable
doc: ChangeLog update for v0.8.24
npm: Upgrade to 1.2.25
url: remove unused global variable
uv: Upgrade to 0.10.10
2013.06.04, Version 0.10.10 (Stable)

* uv: Upgrade to 0.10.10

* npm: Upgrade to 1.2.25

* url: Properly parse certain oddly formed urls (isaacs)

* stream: unshift('') is a noop (isaacs)
Merge branch 'v0.10.10-release' into v0.10
blog: Release v0.10.10
Now working on v0.10.11
net: Destroy when not readable and not writable

This is only relevant for CentOS 6.3 using kernel version 2.6.32.

On other linuxes and darwin, the `read` call gets an ECONNRESET in that
case.  On sunos, the `write` call fails with EPIPE.

However, old CentOS will occasionally send an EOF instead of a
ECONNRESET or EPIPE when the client has been destroyed abruptly.

Make sure we don't keep trying to write or read more in that case.

Fixes #5504

However, there is still the question of what libuv should do when it
gets an EOF.  Apparently in this case, it will continue trying to read,
which is almost certainly the wrong thing to do.

That should be fixed in libuv, even though this works around the issue.
npm: Upgrade to 1.2.27
build: add pkgsrc rule