Improve zen mode internals.

- remove the `console`. Probably for testing. It shows up on my `rspec` and spinach, cluttering them.
- ESC exists on jQuery UI.
- remove trailing whitespace. Use Vim with http://stackoverflow.com/questions/4617059/showing-trailing-spaces-in-vim
- remove `;`. Becomes bright red on Vim with https://github.com/kchmck/vim-coffee-script/

cc @Razer6