up-arrow-circle === down-arrow-circle (solid)
up-arrow-circle and down-arrow-circle both result in down-arrow-circle (solid)
- documentation
- implementation via web-components

Expected behavior is that up-arrow-circle has an arrow pointing up.

![image](https://user-images.githubusercontent.com/10984593/57831454-765b6d80-77b5-11e9-8727-0c4f9177b730.png)
