Minify Javascript when building for production

In dev environments, the Javascript will remain un-minified for
ease of debugging.
Upgrade Angular 1.2.0-rc.2 to 1.2.0-rc.3

Angular 1.2.0 RC 3 is expected to be the last release candidate before
the 1.2.0 stable release, according to its changelog. And it includes
some bugfixes connected to animations, which we'll probably want.
Use correct name for minified combined script
Use Google's CDN to get Angular in production

In development, we'll continue to get Angular from our local servers.
Merge branch 'feature/minify-js'