Bartender shotgun changes

Ported from NTStation13
>Adds 5 new styles to the barman's shotguns, and allows the bartender to rename their gun. 
![ss 2014-03-12 at 10 47 01](https://f.cloud.github.com/assets/3889088/2406117/d656f5cc-aa62-11e3-995b-e21272d51689.png)
![ss 2014-03-12 at 10 47 13](https://f.cloud.github.com/assets/3889088/2406118/d7c933a2-aa62-11e3-8329-bb2ccd81147c.png)
From left to right:
Standard Walnut (original), Dark Red Finish, Ash, Faded Grey, Maple, and Rosewood.
Sprite credit to Stephie! Thank you.