Fixed a bug with multiple rotations at the same time.

Made sample actions behavior a subclass of the Actor class.

Added new subclass for the Actor - MeshActor. This actor let's the actions to modify the mesh (i.e. Skew).

Added new actions:
ActionSkewBy.cs
ActionRandom.cs

src/ActionsInterval/ActionRotateBy.cs

@@ -32,8 +32,6 @@ class ActionRotateBy : ActionInterval
     {
         float d = dt / duration;
         Vector3 tgt = delta * d;
-        transform.Rotate(Vector3.up, tgt.y);
-        transform.Rotate(Vector3.right, tgt.x);
-        transform.Rotate(Vector3.forward, tgt.z);
+        transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles + tgt);
     }
 }

src/ActionsInterval/ActionRotateTo.cs

@@ -42,8 +42,6 @@ class ActionRotateTo : ActionInterval
     {
         float d = dt / duration;
         Vector3 tgt = path * d;
-        transform.Rotate(Vector3.up, tgt.y);
-        transform.Rotate(Vector3.right, tgt.x);
-        transform.Rotate(Vector3.forward, tgt.z);
+        transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles + tgt);
     }
 }

src/ActionsInterval/ActionSkewBy.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+class ActionSkewBy : ActionInterval
+{
+    protected Vector3 skewAngles1;
+    protected Vector3 skewAngles2;
+    protected Mesh mesh;
+
+    public ActionSkewBy(Vector3 tgtAngles1, Vector3 tgtAngles2, float tgtDuration)
+        : base(tgtDuration)
+    {
+        skewAngles1 = tgtAngles1;
+        skewAngles2 = tgtAngles2;
+    }
+
+    public override Action clone()
+    {
+        return new ActionSkewBy(skewAngles1, skewAngles2, duration);
+    }
+
+    public override Action reverse()
+    {
+        return new ActionSkewBy(-skewAngles1, -skewAngles2, duration);
+    }
+
+    public override void start()
+    {
+        base.start();
+        if (!(target is MeshActor))
+        {
+            throw new Exception("You should use MeshActor class instead of Actor, if you want to skew your object.");
+        }
+    }
+
+    public override void stepInterval(float dt)
+    {
+        float d = dt / duration;
+        Vector3 tgt = skewAngles1 * d;
+        ((MeshActor)target).skewAngles1 += tgt;
+        tgt = skewAngles2 * d;
+        ((MeshActor)target).skewAngles2 += tgt;
+    }
+}