A bit more functionality from OpenX API included

[DoppioJP]

Hi,

Thanks for your gem. As I needed a bit more functionality, I forked it, added it, used that successfully since for over a year. I also noticed that many people are using my version. I think it would be worth to merge it with your one back. Just recently someone pointed out to me that I should send you pull request and I just realised, that I haven't yet.

Cheers