title: NuGet: Unknown option "-co" on push
body: <p>I am creating a nuget build for one of my projects. I already have a nuget package build for a similar project where everything works as expected. However, this new nuget build definition fails, and the error message I get is: </p>
  
  <pre><code>Error reported in the NuGet Process: Unknown option: '-co' 
  </code></pre>
  
  <p>This is given on the following build step: </p>
  
  <pre><code>PushWithNuGet
    Push Arguments: push "MyLocation\MyPackage.nupkg" 
    29f90a50-debe-4a44-ad1a-f7a5dcc354c1 -co -s "http://myPackageServer/"
  </code></pre>
  
  <p>The exact same command is being called for the mentioned similar build, and there is works. So it doesn't seem to me like the command doesn't exist - even though I can't see it in the <a href="http://docs.nuget.org/docs/reference/command-line-reference#Push_Command" rel="nofollow">nuget documentation</a>. </p>
  
  <p>So; why do I get this error? </p>