Update CSF.Core library

This updates the library to commit b564333d0dbb52b1f7248b3a80a38f5f622a751d
(within that repository).
Resolve #7 - Add NHibernateQuery type

This provides some abstraction over an ISession's Query<T>() extension method
and provides a queryable data-source in a way that can be (for the most part)
mocked.
Merge branch 'feature/7-nhibernate-iquery'