Sql parameters

I have implemented the IDbConnection extension methods for InsertParameterized and UpdateParameterized to wrap the IDbCommand methods.

Also have implemented SelectParamaterized for simple lambda's. This will work for simple selects, but still needs some more work for more complex string ops.

Added unit tests for oracle for these methods, fixed a couple of issues with oracle sequences and the previously added IDbCommand CreateParameterizedInsert.

Let me know if anything is out of line etc.