Choose items from an NSDictionary

Adds the ability to choose options from NSDictionary.

I needed to add some explanation for each option to my designer, instead of relying on integers for different animation types.

This uses a UIPickerView to show different keys from the dictionary and their values.

![screen shot 2014-08-11 at 7 06 13 pm](https://cloud.githubusercontent.com/assets/5565147/3878679/7670e42a-2171-11e4-9d1c-4d2e9171be8c.png)

![screen shot 2014-08-11 at 7 06 46 pm](https://cloud.githubusercontent.com/assets/5565147/3878685/85a8d0ce-2171-11e4-9074-28ba1e294676.png)