Beta 1.01

Added a debug log where a major problem resides. I think the issue is
that sometimes, when there birds have been deleted from the array,
itween can’t move the newbirdinfront to the back because newbirdinfront
sometimes becomes null. This happens because newbirdinfrontis simply
defined by adding the birdinfront variable to the string Bird. If
birdinfront is 0, then newbirdinfront can be Bird0. iTween attempts to
move Bird0, but sometimes Bird0 doesn’t exist in the scene anymore.
Will continue to sort out.