title: Is there any way to remove a shadow class from Robolectric?
body: <p><a href="http://pivotal.github.com/robolectric" rel="nofollow">Robolectric</a> has a shadow class named <code>ShadowMatrix</code> but I don't want to use it. How to remove it from robolectric? I hope to use original <code>Matrix</code> class instead.</p>