2.2.5-pre3

• Fixed bug where a dynamic stored procedure wouldn't dispose its database connection if the stored procedure threw an exception.
• Fixed bug #59 - in the dynamic syntax where asynchronous execution of a stored procedure that has no results would not throw exceptions from sql server.
• Fixed bug #57 - StoredProcedure<dynamic> (both syntaxes) would return DBNull values instead of null.
• Fixed bug #63 - WithInputOutputParameter and WithOutputParameter would not infer DBType when not passed explicitly
• Fixed bug #17 - symbols were not available for .Net 4.0 projects
• Fixed bug #64 - custom structs could not be passed to the dynamic syntax
• Fixed bug #65 - Enum types will now automatically be sent as strings instead of object