Missing 'Sort' option
Love this so far but I can't seem to sort items - I've grouped and named my items just like int he example but don't see it in the 'Plugins > Sketch Mate' menu.

![image](https://cloud.githubusercontent.com/assets/197548/9444973/9adaeb64-4a81-11e5-8720-41dd22a8965e.png)
