Moving PlayerSkill objects to PlayerAttributes.
Merge branch 'master' of github.com:mmwk/MMWK

Conflicts:
	Classes/Scenes/BattleScene.m
	Classes/Scenes/MainMenu.m
Fix inconsistency with SkillsMenu position being set outside.
Deleted some old files.
Implemented basic experience gain after battle.
Merge remote-tracking branch 'origin/master'

Conflicts:
	Classes/Layers/BattleLayer.m