Throw ArgumentNullException on Post.
Add feature to define OnDeserialized hook for a type.
Added test for fluent mapping of GetOnDeserializedHook().
Make items of always-expanded collection properties expanded too. Also support for fluent configuration of AlwaysExpand has been added,
Only apply fluent rule AsIndependentTypeRoot() for declaring class, not subclasses.
Bumped version to 0.2.2-alpha5.