Supports medium-trust for mapping to public members, null-value expressions, and more.

• Supports medium-trust when mapping to public members (or reflection).
• Supports expressions for nullValue (like MinValue) by Jeff Lanning.
• Added queryOnly setting for relations for OPath without actual loading.
• Additional method overloads for consistency with OPath and Generics.
• QueryHelper now handles Bool values (configurable for CustomProvider).
• Include original Exception for Connection errors for better debugging.
• OPath Support for more features: subEntity, relation filters, sortOrder.
• Allow Enum values to be either Strings or Ints -- thanks to Peter Goetzl.
• Bug Fixes: Recursive non-LazyLoad Issues, Recursive Cascade Deletes.
• Bug Fixes: Unchanged Parent PersistChildren, Update InitialState Always.
• Bug Fixes: Oracle String Parameter Type, Relationships with Stored Procs.
• Bug Fixes: Composite Key Embedded Objects and ObjectSets by Peter Goetzl.
• ORHelper: Include alias for relations to better support OPath Engine.
• Demo App: Include defaultNamespace and alias for relations in mappings.
• Example App: defaultNamespace, alias for relations, and OPath example.
• And another special thanks to Jeff Lanning for continued OPath support.