* buffer: Add Buffer.isEncoding(enc) to test for valid encoding values (isaacs)
* Raise UV_ECANCELED on premature close. (Ben Noordhuis)
* Remove c-ares from libuv, move to a top-level node dependency (Bert Belder)
* ref/unref for all HandleWraps, timers, servers, and sockets (Timothy J Fontaine)
* addon: remove node-waf, superseded by node-gyp (Ben Noordhuis)
* child_process: emit error on exec failure (Ben Noordhuis)
* cluster: do not use internal server API (Andreas Madsen)
* constants: add O_DIRECT (Ian Babrou)
* crypto: add sync interface to crypto.pbkdf2() (Ben Noordhuis)
* darwin: emulate fdatasync() (Fedor Indutny)
* dgram: make .bind() always asynchronous (Ben Noordhuis)
* events: Make emitter.listeners() side-effect free (isaacs, Joe Andaverde)
* fs: Throw early on invalid encoding args (isaacs)
* fs: fix naming of truncate/ftruncate functions (isaacs)
* http: bubble up parser errors to ClientRequest (Brian White)
* linux: improve cpuinfo parser on ARM and MIPS (Ben Noordhuis)
* net: add support for IPv6 addresses ending in :: (Josh Erickson)
* net: support Server.listen(Pipe) (Andreas Madsen)
* node: don't scan add-on for "init" symbol (Ben Noordhuis)
* remove process.uvCounters() (Ben Noordhuis)
* repl: console writes to repl rather than process stdio (Nathan Rajlich)
* timers: implement setImmediate (Timothy J Fontaine)
* tls: fix segfault in pummel/test-tls-ci-reneg-attack (Ben Noordhuis)
* tools: Move gyp addon tools to node-gyp (Nathan Rajlich)
* unix: preliminary signal handler support (Ben Noordhuis)
* unix: remove dependency on ev_child (Ben Noordhuis)
* unix: work around darwin bug, don't poll() on pipe (Fedor Indutny)
* util: Formally deprecate util.pump() (Ben Noordhuis)
* windows: make active and closing handle state independent (Bert Belder)
* windows: report spawn errors to the exit callback (Bert Belder)
* windows: signal handling support with uv_signal_t (Bert Belder)