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

As seen on https://github.com/d3athrow/vgstation13/pull/1294.

I may as well use this PR for some other minor sprite changes, first off the bowler hat with the old sprites on the left and new ones on the right. [Flashkirby](http://baystation12.net/forums/viewtopic.php?f=44&t=6197) created the item sprite and I made 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.