Convention update to match ASP.NET MVC default convention

[nblumhardt]

Love the new MEF dependency resolver! :)

To make this consistent with the convention we're recommending for use with ASP.NET MVC, it would be nice to allow subfolders of /Parts, e.g.:

/Parts
/Data
/...

To do that, we normally check for ".Parts." within the type's namspace, e.g. instead of:

        t => t.Namespace != null && t.Namespace.EndsWith(".Parts")

We use the convention:

        t => t.Namespace != null && (t.Namespace.EndsWith(".Parts") || t.Namespace.Contains(".Parts."))