updated location of built Realm.framework for rubymotion example

We neglected to update the location of `Realm.framework` in the rubymotion example. However, the example no longer works, saying it can't find the `i386` version of the framework, even though `lipo` confirms it's in there.

![image](https://cloud.githubusercontent.com/assets/474794/4510483/e6195bb2-4b2a-11e4-8efe-9a9444693234.png)

I'm hoping @alloy can swoop in and shed some light on this.