Added Halloween bats!

I've added 3 bats to the site for a Halloween theme! They won't show up
because the HTML lines refer to the actual website for the JS code. To
test it locally, change the URL in the HTML to your downloaded LS repo.
It should look like: C://documents/Github/Learning-Scratch/jsbat.js/.
Could you quickly check the JS code to make sure it's not sending off
info about the website? Thanks!