Fixes Nitrogen is not defined

Hi Jesse,
playing with last changes, I found when you enter to index page, this error appears:

ReferenceError: Nitrogen is not defined
...NbH2jsTvzT4atAFUYFl4OA93v4e1GuDfZXWjiItuUbSUO-eqd6H_hu_h6D_mT63OPwcgEXrmkLwRmRew...
localhost:8000 (línea 26)

TypeError: a.value is undefined
...ass.prototype.encode_binary=function(a){return this.BINARY+this.int_to_bytes(a.v...
bert.min.js (línea 1, col 3192)

and the click button event doesn't work. Seems that stopped working with the jquery update.