Create feral_howl.lua

add missing ability script for beastmaster feral howl. this is a rough draft which needs tweaking so that it matches retail specs. the ability recognizes the monster jackcoat +2 but I am not sure how to make it check for augment.
No mod value. You are applying zero for the amount of that modID. Augments do not work as an on/off switch and it isn't logical to try and make them work that way even if only one item (currently!) exists that will use a given AugmentID. In most cases, "1" will suffice giving the augment a valid value range of 0 to 31. As an EXAMPLE ONLY If you set that mod value in the augment table to 5, then equip an item that has that augment with a power of 3, you would get 15 points of mod 503.