Added API for Retrieving Credit History

Can you make sure your test credit history button works on 4S? I think we could probably remove that top URL line associated with getLongUrl since no one uses it.
![ios simulator screen shot oct 11 2014 1 55 52 pm](https://cloud.githubusercontent.com/assets/1332632/4604132/246a2c3e-5189-11e4-8e40-448b6526bf54.png)