MercBot Submission

This bot doesn't win ALL the time, but it definitely pretty consistently wins, at least against the default bots. It will still occasionally fall short of the 100k goal, but I think it succeeds often enough for me to consider submitting it. If I'm unlucky, I've got a 2nd attempt allowed, so why not?

I also included the fix to challenger_test.js as proposed by /u/tollus