Mega-Updates

* Add fading title/logo swap to banner.
* Settle on working Closure Compiler config.
* Switch to angular-busy from angular-promise-tracker.
* Remove unused font (Adagio Sans, we hardly knew ye).
* Switch icons from Symbolicons to Ionicons, with backing from GitHub's
  Octicons.
* Add and configure Typekit Webfont Loader.
* Move Angular bootstrap command to after DOM ready.