Total remake of samples page

Review URL: https://chromiumcodereview.appspot.com//70163010
Merge branch 'dart-1.0' of https://github.com/dart-lang/dartlang.org into dart-1.0

Conflicts:
	src/site/events/2013/flight-school/css/style.css
	src/site/events/2013/flight-school/js/app.js