title: Caliburn.Micro when setting VM to inherit Screen, overrides title field in View
body: <p>If I have a ViewModel like so:</p>
  
  <pre><code> public class ViewModel : IPropertyChangeBase, IViewModel
   {
   }
  </code></pre>
  
  <p>The "Title" property I set in the xaml of the view it's bound to properly shows.</p>
  
  <p>If I have the ViewModel inherit from Screen instead what shows up in the title is the complete type name of the ViewModel, like "MarksProject.ViewModels.ViewModel." This shows up on the window's title.</p>
  
  <pre><code> //View Title property being overriden.
   public class ViewModel : Screen, IViewModel
   {
   }
  </code></pre>