title: Cannot remove reference to EF version 6 in build
body: <p>I am using TFS 2010 and VS 2012.</p>
  
  <p>I failed in my attempt to upgrade MVC4 to MVC5. I thought I rolled back my project OK in TFS but my builds fail because the references to EF version 6 have not all been removed.</p>
  
  <p>As far as I can tell I have removed EF v6 everywhere in my code. However in my build I have the following message;</p>
  
  <blockquote>
    <p>Unified primary reference "EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089".<br>
    Using this version instead of original version "4.4.0.0" in "C:\Builds\3\solutionA\solutionA- Test\Sources\projectB\projectB\bin\Debug\projectB.dll" because AutoUnify is 'true'.<br>
    Resolved file path is "C:\Builds\3\solutionA\solutionA - Test\Sources\MVC4\solutionA\solutionA.Model\lib\EntityFramework.dll".<br>
    Reference found at search path location "{CandidateAssemblyFiles}".  </p>
  </blockquote>
  
  <p>So what does "AutoUnify is true" mean?</p>