Improve zen mode internals.

Created by: cirosantilli

• 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