switched prefab sprites
Merge branch 'master' of https://github.com/khhle/Stalingrad

Conflicts:
	Assets/Prefabs/unit_GermanATSquad.prefab
	Assets/Prefabs/unit_GermanBomber.prefab
	Assets/Prefabs/unit_GermanFighter.prefab
	Assets/Prefabs/unit_GermanFlak30.prefab
	Assets/Prefabs/unit_GermanPanther.prefab
	Assets/Prefabs/unit_GermanPanzer.prefab
	Assets/Prefabs/unit_GermanSniper.prefab
	Assets/Prefabs/unit_GermanSquad.prefab
	Assets/Prefabs/unit_GermanWirbelwind.prefab
	Assets/Prefabs/unit_RussianBomber.prefab
	Assets/Prefabs/unit_RussianCannon.prefab
	Assets/Prefabs/unit_RussianFighter.prefab
	Assets/Prefabs/unit_RussianSniper.prefab
	Assets/Prefabs/unit_RussianSquad.prefab
	Assets/Prefabs/unit_RussianT28.prefab
	Assets/Prefabs/unit_RussianT34.prefab
	Assets/Prefabs/unit_RussianT60.prefab
	Assets/Scenes/s1.unity