title: Pack contents of subfolder using nuget
body: <p>I've got a project I want to turn into a nuget package. The folder structure looks like this:</p>
  
  <pre><code>build/
       /stuff
            /Iwant
       /topack
  stuffidontwantto.pack
  mynuspec.nuspec
  </code></pre>
  
  <p>I want to pack everything under the build folder except for the build folder itself.</p>
  
  <p>In the end I want the root of my package to look like this:</p>
  
  <pre><code>/stuff
      /Iwant
  /topack
  </code></pre>
  
  <p>I'm doing this right now:</p>
  
  <pre><code>&lt;files&gt;
      &lt;file src="build/**/**" /&gt;
  &lt;/files&gt;
  </code></pre>
  
  <p>Except when I create the package, the build folder is included.</p>
  
  <p>How do I get just the contents of the build folder?</p>