AI Section with Example

This has AI portions of creeps/towers done. Has an .exe that shows the
logic. Also has basic gameplay elements. (Needed for testing.)
Release EXE

Sorry, debug exe doesn't work on some machines. This should be better.
Code Cleanup

Cleaned up a lot of code, made the Update Functions for Tower / Creep
very clean. Added in more comments for each function. Also added in a
question for Atttacker::Attack. If anyone has any problems, or
questions, ask me.
Become a programmer, they said. It'll be fun, they said.
Merge pull request #3 from EunoTheBard/master

AI Stuffs