DontDestroyOnLoad.cs - For manager objects that stick around

using UnityEngine;
using System.Collections;

//This will mark an object as something not to be destroyed when loading a new scene. Good for game/score managers that handle
//game flow, and need to retain the data they have.

public class DontDestroyOnLoad : MonoBehaviour {

    void Awake () {
        DontDestroyOnLoad( transform.gameObject );
    }

}