Added beanbag shotguns to the tactical armoury

See forum thread: http://baystation12.net/forums/viewtopic.php?f=5&t=10100&start=30#p212906

![screenshot 2014-04-18 15 44 42](https://cloud.githubusercontent.com/assets/242428/2745255/26245d64-c733-11e3-88a0-3b44d2da71e3.png)