* Upgrade V8 to 3.9.2
* Revert support for isolates. (Ben Noordhuis)
* cluster: Cleanup docs, event handling, and process.disconnect (Andreas Madsen)
* gyp_addon: link with node.lib on Windows (Nathan Rajlich)
* http: fix case where http-parser is freed twice (koichik)
* Windows: disable RTTI and exceptions (Bert Belder)
* Update V8 to 3.8.9
* Support for sharing streams across Isolates (Igor Zinkovsky)
* #2636 - Fix case where http_parsers are freed too early (koichik)
* url: Support for IPv6 addresses in URLs (Łukasz Walukiewicz)
* child_process: Add disconnect() method to child processes (Andreas Madsen)
* fs: add O_EXCL support, exclusive open file (Ben Noordhuis)
* fs: more specific error messages (Tj Holowaychuk)
* tty: emit 'unknown' key event if key sequence not found (Dan VerWeire, Nathan Rajlich)
* build: compile release build too if BUILDTYPE=Debug (Ben Noordhuis)
* module: fix --debug-brk on symlinked scripts (Fedor Indutny)
* zlib: fix `Failed to set dictionary` issue (Fedor Indutny)
* waf: predict target arch for OS X (Fedor Indutny)