Muzzle and spear sprite edits.

As per request, I have fixed the prone spear sprite, and moved the muzzle down 1 pixel to stop it from blocking the eyes on the front and prone sprites.

![ss 2013-08-27 at 05 54 00](https://f.cloud.github.com/assets/5324789/1038939/77a34a6c-0f71-11e3-8eed-9c06d5ae230b.jpg)