Add mafiapp_enemies record and mnesia table
Add mafiapp:add_enemy/2
Add mafiapp:find_enemy/1
Add mafiapp:killed_enemy/1
Add test for mafiapp enemy behavior
Bump version of mafiapp to 1.0.1
Update mafiapp:friend_by_expertise/1 to use QLC
Update mafiapp:debts/1 to use QLC