title: Watching a values in a service from a controller
body: <p>I have created a service to isolate the business logic and am injecting it in to the controllers that need the information. What I want to ultimately do is have the controllers be able to watch the values in the service so that I don't have to do broadcast/on notification or a complex message passing solution to have all controllers be notified of changes to the data in the service.</p>
  
  <p>I've created a plnkr demonstrating the basic idea of what I'm trying to do.</p>
  
  <p><a href="http://plnkr.co/edit/oL6AhHq2BBeGCLhAHX0K?p=preview">http://plnkr.co/edit/oL6AhHq2BBeGCLhAHX0K?p=preview</a></p>
  
  <p>Is it possible to have a controller watch the values of a service?</p>