Computer Beats Me!

Completely working. Freebies are successful. The computer beat me and I
tried 100% (DEPTHLIMIT was 5 moves, so it was making its moves in under
a second). I'm very happy (good commit message content...). Maybe there
can be some refinement to the values for heuristics but it seems like I
chose well.

We still need to make different difficulty levels. And maybe see if a
brute force solution can be done to make myself sad.
Bug fixes and option and difficulty additions

Fixed broken freebie movement. Added difficulty levels that change how
far ahead the computer moves (Hard takes a bit too long right now). Also
added a control to whether or not you see the computers thought process.
And added some code to make sure that being sent to the same square your
in if the expected box is won works perfectly.