http://msdn.microsoft.com/en-us/library/windows/apps/br211439.aspx, says <Framework> in the package manifest "Indicates whether
the package is a framework package; that is, a package that can be used by other packages."
Is there example code for creating a framework package and using it from an app? I'm looking for a mechanism to create a "library" package
that can be loaded by an app, sort of how we would load a dll.