title: After removal of a dependency in composer, the directory persists
body: <p>When I run the <code>composer.phar</code> to update changes, everything goes OK. But when I run it again to delete unneeded dependencies, the dependencies are deleted but their directory structure persists such as <code>mopa/bootstrap-bundle</code>.</p>
  
  <p>Are there any way to do that properly using Composer?</p>