title: Prism.Unity.Wpf problem: UnityServiceLocatorAdapter is missing after update
body: <p>After updating <strong>Prism</strong> in a WPF application from version 7.2.0.1422 to version 8.0.0.1909, the <strong>GetInstance</strong> method no longer works:
  CommonServiceLocator.ServiceLocator.Current.GetInstance
  The message is issued: “ServiceLocationProvider must be set”
  I found that version 8 was missing the Prism.Unity.Wpf.<strong>UnityServiceLocatorAdapter</strong> class which was present in version 7 and which provided the ServiceLocator to work.
  Q: How do I now take advantage of the CommonServiceLocator.ServiceLocator.Current.GetInstance?</p>