Remove all AngularJS and Clang code.
Experimental routing setup. Create async and ui libs.

The `raiseyourgame.lib.async` and `raiseyourgame.lib.ui` files are both
modeled on the underlying code of David Nolen's core.async blog posts,
with some modifications to use jQuery where appropriate. I don't mind
keeping a hybrid Google Closure and jQuery system, even though the
Closure library would handle all my use cases if I took the time to
really learn it.

Experimental routing using Secretary. Will use shoreleave-browser for
HTML5 history. Basic app structure is still evolving.
Add further CLJS REPL explanation to README.