Significant performance impact

It's too slow, unfortunately.

The Array.forEach call is too expensive.

Also, organize the numeric settings a bit on the ReadableState class

It was testing the length *before* adding the current chunk, which
is the opposite of correct.

Also, the return value was flipped.

That is, the transform is triggered by a _read, not by a _write.

This way, backpressure works properly.

Conflicts:
	AUTHORS
	ChangeLog
	deps/uv/test/test-spawn.c
	deps/uv/uv.gyp
	src/cares_wrap.cc
	src/node.cc
	src/node_version.h
	test/simple/test-buffer.js
	tools/gyp/pylib/gyp/common.py
	tools/install.py

* npm: Upgrade to 1.1.69

* fs: fix WriteStream/ReadStream fd leaks (Ben Noordhuis)

* crypto: fix leak in GetPeerCertificate (Fedor Indutny)

* buffer: Don't double-negate numeric buffer arg (Trevor Norris)

* net: More accurate IP address validation and IPv6 dotted notation. (Joshua Erickson)