This speeds up http_simple by around 6%.

Speeds up http benchmarks.

More detailed information in GH-693

While it's true that error objects have a history of getting snake_case
properties attached by the host system, it's a point of confusion to
Node users that comes up a lot.  It's still 'experimental', so best to
change this sooner rather than later.

This adds a process._fatalException method which is called into from
C++ in order to either emit the 'uncaughtException' method, or emit
'error' on the active domain.

The 'uncaughtException' event is an implementation detail that it would
be nice to deprecate one day, so exposing it as part of the domain
machinery is not ideal.

Fix #4375

Make `fs.createReadStream({ end: 42 })` work.

Before this commit, it worked only when used like this:
`fs.createReadStream({ start: 0, end: 42 })` - only when `start` was specified
by the caller.

Fixes #4423.

Said function has been broken (and useless) since v0.6.0. Remove it altogether.

Fixes #3854.

Stop using `arguments` for performance and readability.

Remove a lot of branches from the inner loop. Speeds up buf.toString('base64')
by about 20%.

Before:

  $ time out/Release/node benchmark/buffer-base64-encode.js
  real    0m6.607s
  user    0m5.508s
  sys     0m1.088s

After:

  $ time out/Release/node benchmark/buffer-base64-encode.js
  real    0m5.520s
  user    0m4.520s
  sys     0m0.992s

Noted in @shtylman's #3898, API stability notes are easy to overlook
in the html documentation. This can be especially troublesome if the API
is deprecated. This commit gives visual feedback by adding in a class
to the html docs when they're generated. The API headers with
corresponding colors are also listed in the 'About this Documentation'
page for easy reference.

socket.readyState, .readable, and .writable behavior changed as
a result of the new streaming interfaces. Updated to be backwards
compatible with current API and adds regression test.

closes #4461

- Stream.apply -> Stream.call

Use `EventEmitter.call` instead of `EventEmitter.apply` because of performance.

The module variable `END_OF_FILE` was no longer needed from 1d369317.

so that ./configure --tag=foo makes a version number like v0.9.5-foo
instead of v0.9.5foo

This fixes regression introduced in some cases by 8bf0c15a

In repl, calling `repl` twice shows the following message:
```
> repl
A different "repl" already exists globally
```

`domain` should be a member of automatic loading libs in `repl`.

Conflicts:

	lib/repl.js

Since the stream implementer is not expected to overwrite
.end() the finish event is necessary in order to know when
no more data can be written

If the destination had multiply read streams piped to it,
they would all decrease the awaitDrain state and thereby
start the flow

After a stream was unpiped there would stil be residual event handlers

Fix a bug where calling .end() on a socket without calling .connect() first
throws a TypeError:

  TypeError: Cannot read property 'shutdown' of undefined
      at Socket.onSocketFinish (net.js:194:20)
      at Socket.EventEmitter.emit (events.js:91:17)
      at Socket.Writable.end (_stream_writable.js:281:10)
      at Socket.end (net.js:352:31)

Fixes #4463.

Remove obsolete build configuration that escaped the purge in 7eaea7f9.

When building custom `node` versions (e.g., floating features/fixes from
different versions) it's often useful to specify a custom tag which
easily identifies build when invoking `node -v`.

Introduce a way to specify this tag in `node_version.h` file or by
running `./configure --tag="<tag>"`. Insert it right after the patch
version (and before `-pre`, if build is not a release).

Closes #4452.

* streams: Update all streaming interfaces to use new classes (isaacs)

* node: remove idle gc (Ben Noordhuis)

* http: protect against response splitting attacks (Bert Belder)

* fs: Raise error when null bytes detected in paths (isaacs)

* fs: fix 'object is not a function' callback errors (Ben Noordhuis)

* fs: add autoClose=true option to fs.createReadStream (Farid Neshat)

* process: add getgroups(), setgroups(), initgroups() (Ben Noordhuis)

* openssl: optimized asm code on x86 and x64 (Bert Belder)

* crypto: fix leak in GetPeerCertificate (Fedor Indutny)

* add systemtap support (Jan Wynholds)

* windows: add ETW and PerfCounters support (Scott Blomquist)

* windows: fix normalization of UNC paths (Bert Belder)

* crypto: fix ssl error handling (Sergey Kholodilov)

* node: remove eio-emul.h (Ben Noordhuis)

* os: add os.endianness() function (Nathan Rajlich)

* readline: don't emit "line" events with a trailing 'n' char (Nathan Rajlich)

* build: add configure option to generate xcode build files (Timothy J Fontaine)

* build: allow linking against system libuv, cares, http_parser (Stephen Gallagher)

* typed arrays: add slice() support to ArrayBuffer (Anthony Pesch)

* debugger: exit and kill child on SIGTERM or SIGHUP (Fedor Indutny)

* url: url.format escapes delimiters in path and query (J. Lee Coltrane)

Fixes #3226.

Consider a production server that uses a REPL to debug. Creating the instance
would wipe out the global cache of modules, and subsequent "require" calls in
the server would be reloaded from disk. The REPL should observe only, without
altering, its environment.

Starting a line with `**bold**` text makes it think that it's a link,
and get confused.

This should really be fixed properly in the doc generator, but for now,
it's not a major issue.  It's probably just a matter of updating marked.

This fixes windows stdio pipes in streams2 land.