Extract expectations to separate project

Fix for https://github.com/modocache/Quick/issues/29

![quick nimble 2014-06-17 16-04-13 2014-06-17 16-04-19](https://cloud.githubusercontent.com/assets/829783/3300369/46480f52-f620-11e3-8ff9-33ebca92c0f8.png)

I assume these imports are here to use `Callsite`, right? How about creating a `Callsite` struct in the Nimble project? That way, Nimble won't have a Quick dependency. This will help when I put Nimble into its own GitHub repository.