Cow dies in town after Blacksmith is killed

Created a dead cow sprite by modifying a sprite that [Philoctitties](http://www.reddit.com/r/hawkthorne/comments/vwm31/submission_saw_the_cow_on_the_sprite_todo/c58an0e) contributed on the subreddit.

Cow switches to dead state as soon as the blacksmith is killed and a single (for the moment) fly appears over it in a circular loop.

I initially attempted to make the fly a separate node that could be added to any other node as a child, but I couldn't get that to work. If someone else can help me make the fly a separate node it will be a lot easier to apply them in multiples on any node we choose which will be very useful in the future.