2012.01.19, Version 0.6.8 (stable)

* Update V8 to 3.6.6.19

* Numeric key hash collision fix for V8 (Erik Corry, Fedor Indutny)

* Add missing TTY key translations for F1-F5 on Windows (Brandon Benvie)

* path.extname bugfix with . and .. paths (Bert Belder)

* cluster: don't always kill the master on uncaughtException (Ben Noordhuis)

* Update npm to 1.1.0-2 (isaacs)

* typed arrays: set class name (Ben Noordhuis)

* zlib binding cleanup (isaacs, Bert Belder)

* dgram: use slab memory allocator (Michael Bernstein)

* fix segfault #2473
