Added an Atmospherics Hardsuit.

-Added sprites for the hardsuit to the right files.
-Added code in rig.dm for the Atmospheric Hardsuit.

The stats of the Atmospherics Hardsuit are equal to those of the Engineering Hardsuit, so the differences are purely cosmetic in nature. It lets mappers distinguish between hardsuits assigned to Engineering and Atmospherics.

![scrnshot1](https://f.cloud.github.com/assets/3974988/879138/918f5e30-f922-11e2-92a7-ca9ca60ded6f.png)
![scrnshot2](https://f.cloud.github.com/assets/3974988/879136/915d75d2-f922-11e2-964a-2159168f4827.png)
![scrnshot3](https://f.cloud.github.com/assets/3974988/879139/91962ddc-f922-11e2-8133-0e7e46f3a0e2.png)
![scrnshot4](https://f.cloud.github.com/assets/3974988/879140/91965596-f922-11e2-8381-08b907a74313.png)
![scrnshot5](https://f.cloud.github.com/assets/3974988/879141/9197723c-f922-11e2-88db-32235be3399d.png)
![scrnshot6](https://f.cloud.github.com/assets/3974988/879137/9176bc0e-f922-11e2-8fe9-2b6c4f14a4ea.png)
![scrnshot7](https://f.cloud.github.com/assets/3974988/879155/bff281a8-f922-11e2-9d0c-c50dd3caa2aa.png)