Adds new undershirts, jeans and pants by WalterJe

Credits go to WalterJe for those, I just added them to the game.
Check out his sprite thread at https://tgstation13.org/phpBB/viewtopic.php?f=11&t=1659, lots of cool stuff there.
Also adds a jeans locker to the Box locker room, replacing a white wardrobe (there's tons of those anyway).
Sprite Pics:
![2014-11-22-212710_1120x165_scrot](https://cloud.githubusercontent.com/assets/6563111/5156344/1886d160-729a-11e4-8acf-e687596a3f6d.png)
![2014-11-22-222451_759x80_scrot](https://cloud.githubusercontent.com/assets/6563111/5156345/1baf214e-729a-11e4-8eef-ce53d7344925.png)
Ingame Pics:
![2014-11-22-225505_45x43_scrot](https://cloud.githubusercontent.com/assets/6563111/5156355/0e2a36ac-729b-11e4-8ba2-dc4a1a07602a.png) ![2014-11-22-225812_44x47_scrot](https://cloud.githubusercontent.com/assets/6563111/5156356/0e2edb80-729b-11e4-9168-02e6c751331c.png)