Update page title to "cards"
Give keyboard input callback a function name

This makes it easier to debug and profile.
Optimize rendering of Cards and make them get background via props
Give listener function in StoreWatcherMixin a better function name

This helps debugging and profiling
Optimize Location.indexOfBestMatch
Implement Location.prototype.equals
Optimize menu
Simplify RouteStore
Implement CSSClassMutatorMixin
Implement RenderCacheMixin
Optimize Layout.react.js