V8 3.15 has new API functions that let you specify the Isolate. V8 and
node.js generally spend 0.5-3.5% of the time in pthread_getspecific(),
looking up the current Isolate. Avoid that overhead by making "our"
isolate global so we can pass it around. The change to the new API is
introduced in follow-up commits.

Otherwise child procs will never emit a 'close' event if you don't
ever consume their streams, because they will never hit the EOF.

Calling `resume()` on a stream switches it to the old mode which causes
piping stdio from a child process to fail.

Fixes joyent/node#4510.

The test was failing in debug mode because the timeouts were set too
low. Fix that by increasing the timeouts. Admittedly not a great fix.
If this test keeps playing up, it's probably best to remove it.

Fixes #4528.

Tests can leave the tty in non-blocking mode. If the test runner tries
to print to stdout/stderr after that and the tty buffer is full, it'll
die with a EAGAIN OSError. Ergo, put the tty back in blocking mode
before proceeding.

This test is timing sensitive and hence quite unreliable with debug
builds. What's worse is that it leaves a stray child process behind
that listens on the default test port and that makes all the tests
that come after it fail with EADDRINUSE errors.

Allows for arbitrary path to executable spawned using `fork`. This
fixes some issues around running multiple versions of node with workers
and allows arbitrary IPC with compatible executables.

Fixes #3248.

Use static_cast instead of reinterpret_cast when casting from void*
to another type.

This is mostly an aesthetic change but may help catch bugs when the
affected code is modified.

No bufferSize option is used in stream.Writable and fs.WriteStream.

pool size of file reading in ReadableStream can be adjustable
with a bufferSize option.

Remove compiler switches from $(TOPLEVEL)/deps/v8/build/common.gypi,
we set them globally in $(TOPLEVEL)/common.gypi.

Commit 7b4d95a9 introduced the switches again, resulting in V8 getting
built without any optimizations.

This commit is essentially a rehash of commit 4b8629db.

by Sven Panne's suggestion, see [0] for details.

[0]: https://code.google.com/p/v8/issues/detail?id=2468

In JS, the expression ".1" is a floating point number.  Issue 4268 concerns the
REPL interpreting floating point numbers that lead with a "." as keywords.  The
original bugfix worked for this specific case but not for the general case:

    var x = [
        .1,
        .2,
        .3
    ];

The attached change and test (`.1+.1` should be `.2`) fix the bug.

Closes #4513.

* Moved generated files to a clearer directory.
* Improved detection logic for ctrpp.exe tool.

Closes #4482

Some performance counter related functions are not available on Windows
XP and Windows Server 2003, which caused node to call a NULL pointer.

Closes #4462
Closes #4511

Conflicts:
	configure
	deps/uv/src/unix/core.c
	deps/uv/test/test-fs-event.c
	src/node_version.h

Don't give names of built-in libraries special treatment.
Changes the REPL's behavior from this:

  > var path = 42
  > path
  A different "path" already exists globally

To this:

  > var path = 42
  > path
  42

Fixes #4512.

libev has been deprecated since v0.6. Add-on authors have had two major
release cycles to upgrade. Out it goes.

Remove compiler switches from $(TOPLEVEL)/deps/v8/build/common.gypi,
we set them globally in $(TOPLEVEL)/common.gypi.

Commit 7b4d95a9 introduced the switches again, resulting in V8 getting
built without any optimizations.

This commit is essentially a rehash of commit 4b8629db.

GetPointerFromInternalField() is deprecated now, we should use
GetAlignedPointerFromInternalField().

CPU time values must be Numbers, not Integers, as they can be too large
for Integers on 32 bit platforms.

Calling send() on an unbound socket forces an implicit bind to
a random port.

332fea5a made the 'listening' event asynchronous. Unfortunately,
it also introduced a bug where the implicit bind was tried more
than once if send() was called again before the first bind operation
completed.

Address that by keeping track of the bind status and making sure that
bind() is called only once.

Fixes #4499.

* assert: improve support for new execution contexts (lukebayes)

* domain: use camelCase instead of snake_case (isaacs)

* domain: Do not use uncaughtException handler (isaacs)

* fs: make 'end' work with ReadStream without 'start' (Ben Noordhuis)

* https: optimize createConnection() (Ryunosuke SATO)

* buffer: speed up base64 encoding by 20% (Ben Noordhuis)

* doc: Colorize API stabilitity index headers in docs (Luke Arduini)

* net: socket.readyState corrections (bentaber)

* http: Performance enhancements for http under streams2 (isaacs)

* stream: fix to emit end event on http.ClientResponse (Shigeki Ohtsu)

* stream: fix event handler leak in readstream pipe and unpipe (Andreas Madsen)

* build: Support ./configure --tag switch (Maciej Małecki)

* repl: don't touch `require.cache` (Nathan Rajlich)

* node: Emit 'exit' event when exiting for an uncaught exception (isaacs)

Fix #3555