Added Ashes scheme

## Ashes color scheme for Base16 Builder
Added `ashes.yml` to ***base16-builder/schemes***

Preview
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**Ashes Dark**
![ashes_dark](https://cloud.githubusercontent.com/assets/6362150/2890976/322828d0-d52e-11e3-82b6-e39ef9b34f8b.png)

**Ashes Light**
Readability is not great in the light version, yet.
![ashes_light](https://cloud.githubusercontent.com/assets/6362150/2891019/93675634-d52e-11e3-9ba0-80fddbe57662.png)