Circlings and Symlinks

Just changed some of the old square icons into circles. The lock icon I'm pretty pleased with, the Bluegriddon is a bit weird but having no idea what it's for I didn't want to mess with it too much and the disk check will definitely need work by someone better than me. It should suffice for now though.

![screenshot - 270314 - 00 46 36](https://cloud.githubusercontent.com/assets/5920259/2532765/c9f4d3de-b549-11e3-91d2-a9a117dbbd7a.png)  ![screenshot - 270314 - 00 46 56](https://cloud.githubusercontent.com/assets/5920259/2532764/c9f4b87c-b549-11e3-8a7d-37f12fecc34d.png) ![screenshot - 270314 - 00 46 21](https://cloud.githubusercontent.com/assets/5920259/2532766/c9f58a9a-b549-11e3-85cf-7fbffdf5df53.png)

(all have proper borders, not shown here)