title: Appium saying install libimobiledevice but terminal says already installed
body: <p>I am trying to run Appium on a real iOS device.  In the logs I get the following error:</p>
  
  <blockquote>
    <p>The 'idevice_id' program is not installed. If you are running a real
    device test it is necessary. Install with 'brew install
    libimobiledevice --HEAD.</p>
  </blockquote>
  
  <p>I then run brew install libimobiledevice --HEAD in the terminal and get the following warning:</p>
  
  <blockquote>
    <p>libimobiledevice HEAD-5a85432_2 is already installed</p>
  </blockquote>
  
  <p>Anyone know a way around this infinite loop of warnings?</p>