Fixing bundle running

I didn't realize spawn expected just one non-space-separated string. This should fix weird event.js errors cropping up.

Ideally, it'd be nice to code this in a super sexy way, [like grunt's sass compiler task](https://github.com/gruntjs/grunt-contrib-sass/blob/master/tasks/sass.js) which has a super caliente [way of handling arguments](https://github.com/gruntjs/grunt-contrib-sass/blob/master/tasks/sass.js#L76-L89).