Installed book plugin, fixed compiler errors

Assets/External/Book-Page Curl Pro/Scripts/Tween.cs

@@ -0,0 +1,62 @@
+using UnityEngine;
+using System.Collections;
+using System;
+namespace BookCurlPro
+{
+    public class Tween : MonoBehaviour
+    {
+
+        Vector3 from, to;
+        float duration;
+        Action<Vector3> update;
+        Action finish;
+        float elapsedtime = 0;
+        bool working = false;
+        public static Vector3 ValueTo(GameObject obj,
+            Vector3 from, Vector3 to, float duration,
+            Action<Vector3> update = null, Action finish = null)
+        {
+            Tween tween = obj.GetComponent<Tween>();
+            if (!tween)
+                tween = obj.AddComponent<Tween>();
+            tween.elapsedtime = 0;
+            tween.working = true;
+            tween.enabled = true;
+            tween.from = from;
+            tween.to = to;
+            tween.duration = duration;
+            tween.update = update;
+            tween.finish = finish;
+            return Vector3.zero;
+        }
+        static Vector3 QuadOut(Vector3 start, Vector3 end, float duration, float elapsedTime)
+        {
+            if (elapsedTime >= duration)
+                return end;
+            else
+            {
+                return (elapsedTime / duration) * (elapsedTime / duration - 2) * -(end - start) + start;
+            }
+        }
+
+        // Update is called once per frame
+        void Update()
+        {
+            if (working)
+            {
+                elapsedtime += Time.deltaTime;
+                Vector3 value = QuadOut(from, to, duration, elapsedtime);
+                if (update != null) update(value);
+                if (elapsedtime >= duration)
+                {
+                    working = false;
+                    this.enabled = false;
+                    if (finish != null)
+                    {
+                        finish();
+                    }
+                }
+            }
+        }
+    }
+}