Basic Authentication in ASP.NET 5 RC (Web API)

I'd like to implement basic authentication using ASP.NET 5 RC, similar to this article.  Unfortunately, I can't figure out how to mimic this in RC since this link uses IAuthenticationFilter and not sure if/where this exists in the RC?  My gut tells me that ASP.NET 5 does this differently now that MVC and Web API are merged.

http://www.asp.net/web-api/overview/security/authentication-filters

Any ideas would really be appreciated.