Started unit tests for multiple chance dice
Completed unit tests for multiple chance actions, and fixed code to match
Only reactivate chance dice when other chance dice roll, or when everyone has stopped reacting to initiative
- Disable all chance dice owned by a player when one of them is used
- Enable all chance dice owned by all other players when a reaction to initiative gains initiative
Add mocking code to allow overriding of whether the chance die reroll was successful in gaining initiative
Merge pull request #331 from blackshadowshade/87_chance

Added logic to deal with multiple consecutive chance actions
* parse gained_initiative and use that to construct a more meaningful message for the player
Merge pull request #334 from cgolubi1/329_react_initiative

parse gained_initiative and use that to construct a more meaningful message for the player