fix checkbox bug in the mithril TodoMVC example

added an error callback to the hidden check of the clear completed items button. This was done so that frameworks like mithril who remove elements from DOM in stead of putting css-classes like .hidden on elements get through the test suite

The bug is caused by lack of keying.

To reproduce the bug:
1. Open the app
2. Create at least two tasks
3. Complete all tasks
4. Go to the completed view
5. uncheck the top item
6. Voilá, see how the first item in the list now has an unchecked checkbox

Fix typo

Fix broken links

Remove deprecated code and concepts from Backbone.Marionette example

🚀 run jscs over tests

ref:
https://github.com/tastejs/todomvc/commit/07353bcd844b41a2bf214d9c42845b65157a8bf7#commitcomment-13197635
https://github.com/tastejs/todomvc/commit/abee8bdedb4913a6f70b4ad5167fad16ad333def

Ref 07353bcd

This one is exactly the same as the one in the root directory so there's
no reason for it to be in the riot example folder too.

fix homepage link for riotjs.com

- Removed modules, replacing them with a common global namespace
- Added Backbone.Radio as a new dependency
- Removed usage of Wreqr, replacing it with Radio
- Renamed TodoList.js to Router.js to more accurately reflect its
  function
- Moved all application initialization into TodoMVC.Application
- Moved FilterState code into its own file
- Removed inline script in index.html and moved inititialization code
  into TodoMVC.js

update (Atma.js) rewrite the app

Add riot.js 2.0 example

DUEL: App Update (#1110), cancel editing on escape keypress (#789), and routing support (#812)

Update AngularJS case studies links

Replace deprecated Controller

Remove cloud9 and Codio links in the readme

Fix #1428
Fix #957