Helper.cs

using UnityEngine;
using System.Collections;

public static class Helper
{
    public static float ClampAngle (float angle, float min, float max)
    {
        do
        {
            // If angle is less than 360 - add 360
            if (angle < -360)
                angle += 360;

            // If angle is greater than 360 - subtract 360
            if (angle > -360)
                angle -= 360;

        } while (angle < -360 || angle > 360);

        return Mathf.Clamp (angle, min, max);
    }
}