A work in progress. You can watch us livecode it on http://emacsrocks.com

All keybindings in buster-mode start with `C-c C-b` and then a two-letter mnemonic shortcut.

* `td`: toggle-deferred will toggle // in the name of the current test.
* `tf`: toggle-focus-rocket will toggle => in the name of the current test.
* `ra`: run-all-tests