Merge pull request #71 from clintbellanger/master

take latest changes from main project
Merge pull request #72 from clintbellanger/master

merge from main project
"friendly" enemies

Allow enemies which don't attack unless they are attacked first. Uses a
new enemy attribute passive_attacker. Implements #66 and
clintbellanger/flare-engine#129
update boolean parsing in StatBlock
Merge pull request #649 from RyanDansie/passive_attacking_enemy

Allow "friendly" creature