Change app to use diceroller.js submodule
Show dice result icons when rolling

It was a little jarring that the small icons disappeared when you were rolling
a new result, so this fixes it.
Rewrite app.js to not use jQuery

There is no reason why this app should use jQuery other than my familiarity
with it. One less file to cache at least.
Add the "fork me on github" image

I really shouldn't be using any external files if I want this app to be truly
cache-able.
Merge branch 'master' into gh-pages

Conflicts:
	manifest.appcache