Fix FILETIME serialization is corrupt in Mono.
Fix Nullable Boolean Unpack.

Signed-off-by: yfakariya <yfakariya@gmail.com>
Fix Mono testing error.
Code cleanup.
Add nullable tests.
Fix changes.
Regenerate source to merge 0.4 changes and pull request.
Fix platform specific path.
Fix value type enumerator such as List<T> and Dictionary<TKey,TValue> causes infinite loop in Mono and expression flavor serializer.
Fix NilImplication.Prohibit does not work correctly.
Fix possible property handling issue on Mono.
Fix NilImplication.Prohibit for read only collection type member does not work correctly.
Make NilImplication.Null is error for non-nullable value type members.
Fix expression based serializer does not handle NilImplication correctly.
Synchronize project files.
Code cleanup.
Update changes.txt
Memorize doc releases.
Update tags.
Update headers and footers.