Web API Authentication in ASP.NET 5

I’ve been studying ASP.NET 5 for some time now and there is something I’m yet confused. To implement authentication in Web API 2 what I used to do was basically use the OWIN OAuth Authentication Server Middleware. It was simple to use, I could configure just what I needed and there wasn’t a bunch of stuff I needed to put on the app without need for it.

How do I make an XML file an embedded resource in a vNext (ASP.NET 5) class library?

I have an MVC 6 (vNext/ASP.NET 5) project, with one class library for the DAL(Data Access Layer). Now I am getting an exception because NHibernate can’t find the mapping file for an entity I am trying to persist. I have seen strict instructions to mark this XML mapping file as an embedded resource and not to copy to output, but in none of the three property pages I manage to open for this file, is there anywhere to stipulate this.