Test coverage for cando.generations

cando/      covered 65% (1022 of 2940 uncovered)
    generations/      covered 100% (0 of 70 uncovered)
        __init__.py      covered 100% (0 of 6 uncovered)
        evolve10.py      covered 100% (0 of 32 uncovered)
        evolve11.py      covered 100% (0 of 22 uncovered)
        evolve9.py      covered 100% (0 of 10 uncovered)