Added addSegment method to Centipede

simplifies centipede creation
Merge branch 'master' of https://github.com/eazama/SpaceWorms

Conflicts:
	Assets/Prefabs/Resources.meta
	Assets/Prefabs/Resources/Centipede body.prefab
	Assets/Scenes/GameScene.unity
	Assets/Scripts/GameSceneScripts/Centipede.cs
	Assets/Scripts/GameSceneScripts/CentipedeBody.cs
Merge?
Merge??
Merge???