Need more significant digits in rating.
Fix rewind issue with trueskill ratings
Looks like trueskill returns a different value depending on hash order

- Luckily, it appears that this does not matter... because the teams
  are constructed the same way every time
- Even if it did matter, it is only a small rounding error
- This problem showed up while formulating the next commit...
Repairing/replaying results to fix any rating issues

* Closes #36
* Closes #37
* Closes #39
Change Gemfile source.