Added radioactive skill

Fixes #95.

This implementation of radioactive splits one-sided dice into a one-sider and a zero-sider. However, it is trivial to change this back to splitting into two one-siders if this is decided.

There is currently no game-level or interface-level test for radioactive, and this might be a *good thing* to have.  ;)

Also, I'd appreciate feedback on the action logging that I've included for attacker die splitting.

http://jenkins.buttonweavers.com:8080/job/buttonmen-blackshadowshade/491/
(and I'll fix the PMD warnings once I work out how to do so)