Updated the Readme to make it mirror the code in terms of the UserManager injection.
Updated the Readme to make it mirror the code in terms of the UserManager injection.

lnu/NHibernate.AspNet.Identity,lnu/NHibernate.AspNet.Identity,nhibernate/NHibernate.AspNet.Identity,nhibernate/NHibernate.AspNet.Identity,andyshao/NHibernate.AspNet.Identity,andyshao/NHibernate.AspNet.Identity,nhibernate/NHibernate.AspNet.Identity,smallkid/NHibernate.AspNet.Identity,lnu/NHibernate.AspNet.Identity,smallkid/NHibernate.AspNet.Identity,smallkid/NHibernate.AspNet.Identity,andyshao/NHibernate.AspNet.Identity