Adds nitrile gloves

Thicker, more expensive (rarer) latex gloves.
Only 3 on the map total: CMO locker and the two MD lockers.
They do not leave fingerprints.
They're blue, and leave unique fibers, though.

![ss 2014-12-29 at 08 14 05](https://cloud.githubusercontent.com/assets/7247232/5575647/3044d700-8f98-11e4-81fe-7c6e763523c1.png)

Also made latex gloves have a unique sprite, slightly more transparent than white (mime) gloves.