Made animframe_polyfill.js JSHint compliant

Reformatted a bunch to make JSHint happy.
Merge pull request #115 from iirelu/jshint-compliance

Made animframe_polyfill.js JSHint compliant
Update main.css
Add pictures
Merge branch 'gh-pages' of https://github.com/tylerburnham42/2048
Merge remote-tracking branch 'origin/master' into gh-pages