Catch up Node.js assert updates

* Fix bug of deepEqual: https://github.com/joyent/node/commit/aae51ecf7d407b2fb56c1f3e1edf91a16940c973
* Remove unnecessary isNaN(): https://github.com/joyent/node/commit/b87ca794e31096b61ead46911baf92ba1c020a7d#diff-1