Merge remote-tracking branch 'joyent/v0.12' into v1.x

I was originally going to do this after the v0.11.15 release, but as
that release is three weeks overdue now, I decided not to wait any
longer; we don't want the delta to get too big.

Conflicts:
	lib/net.js
	test/simple/simple.status

PR-URL: https://github.com/iojs/io.js/pull/236


Reviewed-By: Bert Belder <bertbelder@gmail.com>
Reviewed-By: Fedor Indutny <fedor@indutny.com>