Fixed a loser dropping issue with Double Elim brackets that have a non-power-of-two number of teams

- when dropping loser, the generator checks to make sure that the round will not be clipped by the match pruner
- added some tests to confirm fix
Merge pull request #39 from K4orta/double-elim-drop-fix

Fixed a loser dropping issue with Double Elim brackets that have a non-p...