Version 1.0.0.4 release.

Version 1.0.0.4 release.
1. Added support for mapping to Nullable types.
2. Added support for mapping to Guids.
3. Abstracted out the various rules of converting types by implementing
an ITypeConverter interface and added implementations for converting
values to Guids, Enums, and value types.
4. 100% complete with XML comments.
5. Added an IContextStorage interface and refactored the existing static
helper ContextStorage class to use the new interface
6. Updated NuGet package.