Suggestion to decrease filesizes

All of the files in the `js` dir start and end with the exact same lines of code. What I did is I moved the first line of code that they all start with into `js/intro.js`. Then I moved the last line of code that they all end with to `js/outro.js`. After telling Grunt what I did, I ran `grunt test && grunt dist-js` and saw the filesizes of the files in `dist/js` drop.

They didn't drop by much though; they lost about half a KB. But, I think that this can be very good because it allows other things that are done over and over again to be put in `js/intro.js` or `js/outro.js` so that the minified files can be even smaller.