Log Marathon version when starting
Add an "X" button to new app modal for consistency
Make command a textarea to allow for larger commands
Remove power on transition and unused styles

The power on transition fades in the <body> content only if transitions
are supported by the browser. It also makes the UI seem slower than
necessary when refreshing the page. This cuts out styles and makes the
UI faaaast.
Re-compile JS for close button and textarea
Update README.md