Artur Rosa

Results 2 issues of Artur Rosa

### What problem does this feature solve? Using `use` function to create mixin from supply definition is fine for components but it is not implemented to be used inside supplies....

![20170725-221801_capture](https://user-images.githubusercontent.com/4105687/28591822-4cdd8582-7187-11e7-97a5-0cbac3a15c41.gif)