[cookbook] Continuous redrawing of views recipe

Recipe uses a timer object which is given to the controller via the router. The controller binds to the `pulse` property of the timer instance. The timer instance observes a property that is changed during an interval created with `Ember.run.later`. The controller also computes a `time` property to display the pulse value and well has creates flags used to render one of three components. The result is the nyan cat animation (via component) and the display of the `time`, "You've nyaned for `time`".

See: http://jsbin.com/iLETUTI/1/