Updated Athena Icon

![athena](https://f.cloud.github.com/assets/470526/2497197/65d3d4f4-b332-11e3-9cf9-3b1030998bf1.png)![marlin](https://f.cloud.github.com/assets/470526/2497734/c50a25b4-b33b-11e3-9fd4-037c76989670.png)


This updates the Athena Icon to fit into the Circle Theme, also some changes to the Krita Icon that remove some unneeded paths that were left over.