node: change AsyncListener API

There was a flaw in the old API that has been fixed. Now the
asyncListener callback is now the "create" object property in the
callback object, and is optional.
node: properly check uid when adding AsyncListener

Instead of checking the uid on the array index of the queue, instead the
object property "uid" was checked on the queue iteself. Because this
will always evaluate to "undefined" the same listener could be added
multiple times to the same context.
crypto: introduce .setEngine(engine, [flags])
doc: Add forward secrecy section to TLS docs

This fixes confusion connected to comparison of ECDH
with RSA and wrong information on forward secrecy.
stream: writes may return false but forget to emit drain

If a write is above the highWaterMark, _write still manages to
fully send it synchronously, _writableState.length will be adjusted down
to 0 synchronously with the write returning false, but 'drain' will
not be emitted until process.nextTick.

If another small write which is below highWaterMark is issued before
process.nextTick happens, _writableState.needDrain will be reset to false,
and the drain event will never be fired.

So we should check needDrain before setting it up, which prevents it
from inproperly resetting to false.
npm: Upgrade to 1.3.23
build: unconditionally disable -Werror

Forcibly disable -Werror, the old { 'werror': '' } hack in node.gyp
no longer works with newer versions of V8.

We support a wide range of compilers, it's simply not feasible to
squelch all warnings, never mind that the libraries in deps/ are
not under our control.

Fixes #6817.
uv: Upgrade to v0.10.22
deps: update openssl to 1.0.1f
doc: fix typo in cluster page
deps: fix openssl assembly error on ia32 win32

`x86masm.pl` was mistakenly using .486 instruction set, why `cpuid` (and
perhaps others) are requiring .686 .
child_process: better error reporting for exec

Report path to executable and argv on error, stderr is not enough in
many cases.

fix #6796
configure: always set `arm_float_abi`

When not specified as a configure flag, and not derived from system
configuration, `arm_float_abi` should be set to `'default'`.

fix #6789
src: revert domain using AsyncListeners

This is a slightly modified revert of bc39bdd.

Getting domains to use AsyncListeners became too much of a challenge
with many edge cases. While this is still a goal, it will have to be
deferred for now until more test coverage can be provided.
node: AsyncListener use separate storage mechanism

Before when an AsyncListener object was created and the "create"
callback returned a value, it was necessary to construct a new Object
with the same callbacks but add a place for the new storage value.

Now, instead, a separate storage array is kept on the context which is
used for any return value of the "create" callback. This significantly
reduces the number of Objects that need to be created.

Also added a flags property to the context to quickly check if a
specific callback was available either on the context or on the
AsyncListener instance itself.

Few other minor changes for readability that were difficult to separate
into their own commit.

This has not been optimized yet.
src: OnFatalError handler must abort()

We are in an unrecoverable state if v8 throws a FatalError, actually
ask the operating system to dump core in this case.

Fixes #6836
test: check RR scheduler has necessary methods

The RR cluster scheduler replaces the normal StreamWrap handle. Because
of this the AsyncListener method failed to be in place when domains were
in use.

The issue was resolved in 828f145 by reverting having domains use
AsyncListeners.

Signed-off-by: Trevor Norris <trev.norris@gmail.com>
http: use writev on chunked encoding

Now will process all write() that were done on a single tick in a single
writev().
domain: fix off-by-one in Domain.exit()

We want to clear the found domain and the domains after it.

Signed-off-by: Trevor Norris <trev.norris@gmail.com>
doc: Fix argument typo in SimpleProtocol example