Adds wins to result set

[meatballs]

Fixes #248

[drvinceknight]

Could you add a quick sentence saying something like 'which shows that Cooperator had 0 wins and Defector 80 wins' (just to point at the order that we get out)?

[marcharper]

Cool! Does this aggregate the wins over tournament repetitions? Just checking if we can make a nice plot of the distribution of wins (like the mean payoff plot).

[meatballs]

At the moment, it aggregates, but I can easily split it out and show the wins per repetition, if that's useful.

[drvinceknight]

At the moment, it aggregates, but I can easily split it out and show the wins per repetition, if that's useful.

I think in the interest of not losing data, this is a good shout. You could have a get_mean_wins_per_repetition method to complement that (or something less horribly verbose)?

[marcharper]

"winsin" -> "wins in"
"wins in " -> "wins in"

[drvinceknight]

This looks great to me! 👍