New sprite for the Juggernaut's shield (forcewall)

Of course saved under a different name so it doesn't interfere with
wizard forcewalls for example.

It was about time it had its own cult themed sprite.
https://dl.dropboxusercontent.com/u/33846352/1410094432584.webm
Did the code for the new Juggernaut shield

Changed the description as well as the sprite (since it was using the
Wizard's)

https://dl.dropboxusercontent.com/u/33846352/juggerwall.png