remove unnecessary call to isNaN()

from https://github.com/joyent/node/commit/b87ca794e31096b61ead46911baf92ba1c020a7d#diff-1
ensure that deepEqual does not depend on arguments order

from https://github.com/joyent/node/commit/aae51ecf7d407b2fb56c1f3e1edf91a16940c973
Merge pull request #6 from teppeis/catch-up-node-assert

Catch up Node.js assert updates