title: Enable-Migrations installation error
body: <p>I'm running into a problem when enabling migrations on one of my projects.
  I execute <b><code>Enable-Migrations</code></b> command from the Nuget Console and receive an error saying:</p>
  
  <pre><code>Exception calling "SetData" with "2" argument(s): "Type 
  'Microsoft.VisualStudio.TeamArchitect.ModelingProject.ModelProjectAutomationObject' in assembly 
  'Microsoft.VisualStudio.TeamArchitect.ModelingProject, Version=11.0.0.0, Culture=neutral, 
  PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."
  At D:\Solution\packages\EntityFramework.5.0.0\tools\EntityFramework.psm1:391 char:5
  +     $domain.SetData('startUpProject', $startUpProject)
  +     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
      + FullyQualifiedErrorId : SerializationException</code></pre>
  
  <p>Has anyone faced this problem before that can point me in the right direction.
  <p><b>Environment:</b><br/>
  .NET 4.5<br/>
  Entity Framework 5<br/>
  Visual Studio 2012 Update 2</p>