Fix unrecognized constructor (SnareAbility.class requires a location
parameter).
Fix bug occurring when a chain-ability lightning-strike proves to be
fatal.
Fix spawn-camping issues
Prepare travis CI
Bug fixes including:
   - NPE on arena start from a null hill. This only occurs when the
arena is started after an abrupt restart or reload.
   - Fix Ability bugs.
   - Avoid arena ending 1 tick after starting due to failed ordering of
events.