+ Add ship HP
- Random select target
Merge branch 'master' of https://github.com/ntchung/cosmonova

Conflicts:
	Assets/Resources/Ships/AssaultCorvette.prefab
	Assets/Resources/Ships/AssaultFrigate.prefab
	Assets/Resources/Ships/AttackDroid.prefab
	Assets/Resources/Ships/BattleCruiser.prefab
	Assets/Resources/Ships/Destroyer.prefab
	Assets/Resources/Ships/Interceptor.prefab
	Assets/Resources/Ships/IonCanonFrigate.prefab
	Assets/Resources/Ships/MarineFrigate.prefab
	Assets/Scenes/Main.unity
- Update prefabs