Removes odd and unncessary use of , null, null, null, null, null, null, null, null, null, null, null, null in event.initEvent(type, bubbles, true)

Almost at the very bottom of event.js an $.Event function that issues events to the browser window using initEvent. The initEvent looked like: 

    event.initEvent(type, bubbles, true, null, null, null, null, null, null, null, null, null, null, null, null)

I removed and ran tests and everything still passed.

This null x 12 as far as I can tell is unnecessary and distracting.