Slow die skill and Giant button skill

Fixes #262.

This has been implemented such that Giant is always slower than every other button.

http://jenkins.buttonweavers.com:8080/job/buttonmen-blackshadowshade/261/
I may be missing something: does this actually work in any case other than the Giant vs. Golo case?

As i understand this solution, it adds a valid initiative die to each non-slow button which will lose to any other valid initiative die.  So in the case of two buttons each of which has no valid initiative dice, the non-Giant one (e.g. Golo) will win.

But in the current implementation, none of Giant's six dice are defined as slow, on the theory that the button special should do all the work for Giant.  So, if one of Giant's dice rolls a 1, and none of the other button's do, why won't Giant simply win initiative outright?