:coffee: code nav.js with coffee, clean up unnecessary jQuery

I like jQuery too, but this isn't the right place to use it, imo.
All JS methods used should work with IE8 (unless coffee sucks)
:bear: add some more keycodes and events
Fuckin jQuery. YEAH
Merge pull request #1 from desert-planet/coffeefy-and-remove-jquery

mixed spaces and tabs, CATS AND DOGS SLEEPING TOGETHER
Merge pull request #20 from kimagure/coffeefy-and-remove-jquery

:coffee: code nav.js with coffee, clean up unnecessary jQuery