pull request to fix to minor warnings

Expecta is great!  I'm using 0.2.2 via Cocoapods and I'm getting these warnings:

![screen shot 2013-08-14 at 1 29 53 pm](https://f.cloud.github.com/assets/538054/964920/63d95c5c-0520-11e3-84ce-6e7cec1bffe6.png)

Thanks!