title: Add slash to fa-video-camera
body: <p>I am working on an app that is using the excellent font-awesome library.  We use the fa-microphone / fa-microphone-slash icons to control microphone muting.  I need something like fa-microphone-slash for a fa-video-camera, so that I can similarly control the webcam with semantics that are familiar to users.  Is there a way to make one from fa-video-camera by compositing FA classes?</p>