title: propertyChanged for server calculated property not firing anymore in 1.4.12
body: <p>i'm displaying a server calculated value to the enduser by using propertyChanged event.
  i was using breeze 1.4.8 and i'm using the productivity stack (ms sql, web api, ef)
  It was working fine.
  Recently i've updated to 1.4.12 and i recognized that this event doesn't get fired anymore.
  The property "A_ProvisionTotal" gets calculated serverside only.</p>
  
  <pre><code>&lt;snip&gt;
      var token = vm.transaction.entityAspect.propertyChanged.subscribe(propertyChanged);
      function propertyChanged(propertyChangedArgs) {
          var propertyName = propertyChangedArgs.propertyName;
          if (vm.transaction.tblEmployees.CalculationMethod == "A" &amp;&amp; propertyName == "A_ProvisionTotal")
              logSuccess('Provision neuberechnet' + '&lt;br/&gt;' + 'Aktuell: ' + $filter('number')(vm.transaction.Provision, 2), true);
  &lt;/snip&gt;
  </code></pre>
  
  <p>Let me know if this is a known regression and if you need more snippets.</p>