Make debugging and logging easier: when a DNS lookup for a hostname
fails, set the hostname as a property on the error object.

Fixes #5393.

A follow-up commit will save the domain name on the request object but
we can't call that property 'domain' because that gets intercepted by
src/node.cc and lib/domain.js to implement the node.js feature of the
same name.

To avoid confusion, rename all variables called 'domain' to 'hostname'.

Before this commit, the SIGUSR1 signal handler wasn't installed until
late in the bootstrapping process and we were prone to miss signals
sent by other processes.

This commit installs an early-boot signal handler that merely records
the fact that we received a signal.  Once the debugger infrastructure
is in place, the signal is re-raised, kickstarting the debugger.

Among other things, this means that simple/test-debugger-client is
now _much_ less likely to fail.

Commit 30e5366b ("core: Use a uv_signal for debug listener") changed
SIGUSR1 handling from a signal handler to libuv's uv_signal_*()
functionality to fix a race condition (and possible hang) in the
signal handler.

While a good change in itself, it made it impossible to interrupt
long running scripts.  When a script is stuck in a busy loop, control
never returns to the event loop, which in turn means the signal
callback - and therefore the debugger - is never invoked.

This commit changes SIGUSR1 handling back to a normal signal handler
but one that treads _very_ carefully.

If a client sends a lot more pipelined requests than we can handle, then
we need to provide backpressure so that the client knows to back off.
Do this by pausing both the stream and the parser itself when the
responses are not being read by the downstream client.

Fix GH-6214

Document the SPKAC functionality that was added in commit 7bf46ba4.

Implements new class 'Certificate' within crypto object for working
with SPKAC's (signed public key & challenge) natively.

This reverts commit aa94450b.

This reverts commit 7f66e44d.

Document the SPKAC functionality that was added in commit 7f66e44d.

Implements new class 'Certificate' within crypto object for working
with SPKAC's (signed public key & challenge) natively.

Don't emit the 'disconnect' event until all workers have gone away.
Before this commit, the event was emitted when all open handles were
closed, which usually - but not always - amounts to the same thing.

Fixes #6346.

Added a NOLINT so that cpplint won't complain about some code.

Because it's possible for the data within a Buffer instance to be
altered after instantiation, or in case a user attempts to do something
like the following:

Buffer.prototype.fill.call({}, 10, 0, 10);

It doesn't result in a segfault.

AssertionError.generatedMessage is now true when
AssertionError.message was generated from expected and actual

Fixes #5836, #6206

This change makes several improvements to the ustack helper and MDB
support:

- ustack helper and MDB: add support for two-byte strings
  (necessary to print many filenames in stacktraces in 0.10 and later).
- ustack helper: fix position numbers, which were off by a factor of two
- ustack helper: fix frames with undefined Scripts (e.g., "RegExp")
- ustack helper: add stub frames
- MDB: add support for sliced strings
- MDB: sync up with changes from the illumos version of the module

Fixes #6309
Closes #6318

Keep track of the reference count, don't make the wrapper object weak
when there are pending write requests.  Fixes a regression from c79d5163.

Mea culpa, I didn't properly resolve a merge conflict in the last two
commits.  The resulting segmentation fault only happened on Linux and
only sometimes.

Fixes #6306.

The previous commit changes the profiler idle notifier so that it only
gets started when a --prof or --prof_lazy argument is specified on the
command line.

This commit adds two internal methods to the process object that allows
one to start and stop the idle notifier programmatically.

The previous commit adds a notifier that tells the V8 profiler when
node.js is idle, i.e. when it's about to start sleeping in the
platform's equivalent of epoll_wait().

This commit adds a heuristic that only starts the notifier when the
V8 profiler is started from the command line.

Inform V8's CPU profiler when we're idle.  The profiler is
sampling-based but not all samples are created equal; mark the wall
clock time spent in epoll_wait() and friends so profiling tools can
filter it out.  The samples still end up in v8.log but with state=IDLE
rather than state=EXTERNAL.

Do a binary search for the maximum RLIMIT_NOFILE.  Works around the
low, low limits on certain high, high-priced devices from Cupertino, CA.

Commit 204228b5 moved a few slow tests to pummel but I forgot to update
the require() path in pummel/test-debugger-repl-break-in-module.  Mea
culpa.

Regression introduced by commit 9ef9a9de.

I haven't actually tested this code, but was reading it due to a
post that linked to the code here:

    http://dailyjs.com/2013/09/26/libuv/

As I was reading through the code, I noticed a path that can't
be reached.

I didn't strictly follow the contributing guide:

    https://github.com/joyent/node/wiki/Contributing

but the change seems safe.

Feel free to close this out. I'm not sure if it was just an oversight
or what.

fixes #6235

Drop the ObjectWrap dependency in favor of an internal WeakObject class.

Let's us stop worrying about API and ABI compatibility when making
changes to the way node.js deals with weakly persistent handles
internally.

Conflicts:
	AUTHORS
	ChangeLog
	configure
	deps/uv/ChangeLog
	deps/uv/src/version.c
	lib/tls.js
	src/node_version.h