React has broken toggle-all checkbox

Bug fix: clicking toggle-all checkbox didn't affect all checkboxes consistently, since setting checked to null means "don't sync with React"

http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx

Added a resource

Added the new CodeSchool course to the resources.

Added YUI library to the repo

Chaplin 1.0.0.

Reactjs: compare through object identity instead of id

Close #783

Fixing Optimized Angularjs's markAll method.

Angular-perf: Fixing conditional that causes the "Clear completed" button to be enabled at the wrong time.

Make React TodoMVC more MVC-ish

Fix parens to bind controller to receive callback correctly

Remove extra parens

Close GH-776: Make sure updateCount works with async Stores

Fix link to the spec

closes #741

Add an example app to the labs for AngularDart without routing.

AngularDart is heavily inspired by AngularJS and is supercharged for Dart. Core
Angular features such as directives, data binding, and dependency injection, are
all there, and they've taken advantage of Dart's features like metadata, types,
and classes to feel natural for Dart developers. AngularDart is also the first
version of Angular to be built on emerging web standards like Shadow DOM.

Fixes typo in firebase-angular