title: Can't find ApplicationOAuthProvider and HostAuthenticationFilter
body: <p>Their use is described in at least a few articles (i.e. <a href="https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/individual-accounts-in-web-api" rel="nofollow noreferrer">http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api</a>) on WebApi 2 authorization, but I can't find what reference I need to have them included. I do have references to Microsoft.Owin/Owin.Security/Owin.Security.OAuth.</p>
  <p>Help?</p>