Edited Completo.blend/.fbx, gun_gimp.png, gun_gimp.xcf and created two
patterns, black_rubber and multiples_plates, issue #268:

 - Edited the textures of the gun and updated the .blend and .fbx files.
   Import to Unity still needed.
Created rifle_bullet_v1.fbx and deleted the same file from another
folder, for issue #325:

 - We had some issues with the other .fbx, now it is fixed.
#338 Creacio de la torreta destruida
Merge remote-tracking branch 'origin/dev' into Grupo-A
Merge branch 'Grupo-A' into dev-sprint5
Merge branch 'Grupo-CD' into dev-sprint5