IE8 Fixes (part 2)

Three small fixes here:

* #434 - CSS tweaks: Adding fallback colors for `rgba`, and swapping `::after` for `:after`
* #435 - Enable CORS support in jQuery
* #430 - Click event handler changes
Well, it's working with this change.  Without this, it doesn't work in IE8.  If you'd rather I didn't include it, that's fine, we'll just add a note to tell people they'll have to make the change manually if they're using a different port.