Update Alpha 1.0.3

[1.0.3]

• Airship pirate class: boss fight now available • Artifacts sytem now in place, you can find out more by defeating the Ariship pirate story boss • Floating Isle 1 cave music added • Treasure chest sprites changed • Mac bug fix: Ninja class would freeze after attacking • Default Enemy Hit Impact sound effect changed • Blacksmith NPC sprite changed • Bird flocks added to Sky Town: Cloud City • Ninja Quest Stage 2 upgraded