Special treatment for Oracle

The generated sql statements for oracle (especially trigger statements) need some additional love to be executed consecutive in a script.

@butonic @LukasReschke @icewind1991 please review - THX
@DeepDiver1975  
![55186113](https://cloud.githubusercontent.com/assets/956847/4596155/589adb14-50a0-11e4-9bfb-e11b1eddfad7.jpg)