pull changes from master to dev on 2014-11-15

This update brings these approved pulls to the dev branch:
* User-visible:
  * #1365: radioactive skill
* Not user-visible:
  * #1405: change `BMDie->roll()` to catch internal logic bugs earlier

Database updates: none

Once this pull is merged, i will load the changes on dev.buttonweavers.com as part of #217.