Update README.md
Update README.md
Update README.md

added tips for theming the game
Update README.md
moved base styles to a separate CSS file and made it easier to create a new theme
added new theme called "scumbag"
Merge commit 'a1ce83d39f62ce24ccffc47605013d7883646ed9' into gh-pages
Merge branch 'master' into gh-pages