title: A member of the System.Security.Claims namespace is not available?
body: <p>I am learning the new Claims-based Authentication methods in .NET 4.5, and am using a Console app to do so. According to MSDN <a href="http://msdn.microsoft.com/en-us/library/system.security.claims.claimsauthenticationmanager.aspx" rel="noreferrer">here</a>, ClaimsAuthenticationManager is a member of System.Security.Claims namespace. As you can see here, I am not getting this option. I have made sure the project is using .NET 4.5. I am missing something simple here... anyone have any suggestions?</p>
  
  <p><img src="https://i.stack.imgur.com/6L2bB.png" alt="System.Security.Claims Intellisense options"></p>