title: PostBuild events are not run on AppHarbor?
body: <p>I've got a postbuild event that is executed just fine locally, but not on AppHarbor:</p>
  
  <blockquote>
  <pre><code> &lt;PostBuildEvent&gt;
    if not exist "$(TargetDir)NativeBinaries" md "$(TargetDir)NativeBinaries" 
    xcopy /s /y /i "$(SolutionDir)packages\LibGit2Sharp.0.8\NativeBinaries\x86\*.*" "$(TargetDir)NativeBinaries\x86" 
    xcopy /s /y /i"$(SolutionDir)packages\LibGit2Sharp.0.8\NativeBinaries\amd64\*.*" "$(TargetDir)NativeBinaries\amd64"
    &lt;/PostBuildEvent&gt;
  </code></pre>
  </blockquote>
  
  <p>What am I doing wrong?</p>