Added struct Position for objects position instead of XNA Vector2
Merge branch 'master' of https://github.com/penjurov/TeamGeorgeOrwell

Conflicts:
	RPG/RPG/RPG/Objects/Hero.cs
	RPG/RPG/RPG/Screens/GameScreen.cs
	RPG/RPG/RPG/bin/x86/Debug/RPG.pdb
Enumeration SkillType extracted in separate class, fixed some minor bugs, due to merge.