ServiceRoutesExtensions.Add<T> with propertyExpressions now returns IServiceRoutes

Just found it a bit annoying that this particular Add method did not return IServiceRoutes, so chaining .Add calls was not possible:

In ServiceRoutesExtensions.cs: 

public static void Add<T>(this IServiceRoutes serviceRoutes, string restPath, ApplyTo verbs, params Expression<Func<T, object>>[] propertyExpressions) 

now returns IServiceRoutes:

public static IServiceRoutes Add<T>(this IServiceRoutes serviceRoutes, string restPath, ApplyTo verbs, params Expression<Func<T, object>>[] propertyExpressions).