Add jscs task

@adamdbradley If it's useful; since you added jscs!

Maybe later you can add to the `validate` task once the rest of the style errors are fixed.

Not sure if you want to run jscs only on `'js/angular/**/*.js'` or all of `'js/**/*.js'`
~200 style errors for `/angular` and ~800 on `/js`

You might find stuff you don't like haha; I added a lot of the rules.