Sprite changes for the mime outfit, bowler hat, money bag and unmined uranium

For the mime outfit you can see the fix at https://github.com/d3athrow/vgstation13/pull/1294.

The following examples will have the old sprites on the left and the new sprites on the right, starting with the bowler hat that [Flashkirby](http://baystation12.net/forums/viewtopic.php?f=44&t=6197) created the item sprite for while I did the mob sprites.
![example](https://cloud.githubusercontent.com/assets/5348175/4688587/88c9ddd4-5682-11e4-856c-de981f6403fa.png)

Next up is the money bag sprite also made by Flashkirby. 
![money bag example](https://cloud.githubusercontent.com/assets/5348175/4688590/e3d4c6e4-5682-11e4-9f1d-df2e65f9c144.png)

I also changed the currently rather ugly sprite for uranium when it's unmined to one from [here](http://baystation12.net/forums/viewtopic.php?f=44&t=11333).
![uranium example](https://cloud.githubusercontent.com/assets/5348175/4688602/59a31182-5683-11e4-9607-a6c1ccaddf64.png)

Finally I removed the justice and metroid hat sprites that have been unused since the great copyright purge.