Cow in town dies after the blacksmith is killed.
Fly that circles over the dead cows body
Added flies.lua. Flies can be added to any node in any multiple desired.
Cleanup and commenting of code.
Check to make sure that the fly node is there when the cow is dead.

There is some weirdness when re-entering a level where nodes are added
and removed multiple times. level:hasNode() lets us check to see if
the flies are there or not.
Check for dead cow on Cow:enter() rather than Cow.new()

This solves all of the problems I was having with level functions
not being accessible and makes everything much cleaner.
undo 2 year changes
Merge pull request #2126 from edisonout/unbirthday

Undo 2 year changes
Merge pull request #2117 from niamu/cow_dead

Cow dies in town after Blacksmith is killed