Updated the Reacher's model file, also updated the Reacher's agent code from eulerAngle to quaternion

Updated the Reacher's model file, also updated the Reacher's agent code from eulerAngle to quaternion

unity-environment/Assets/ML-Agents/Examples/Reacher/Scripts/ReacherAgent.cs

     /// </summary>
     public override void CollectObservations()
     {
-        AddVectorObs(pendulumA.transform.rotation.eulerAngles / 180.0f - Vector3.one);
+        AddVectorObs(pendulumA.transform.rotation);
-        AddVectorObs(pendulumB.transform.rotation.eulerAngles / 180.0f - Vector3.one);
+        AddVectorObs(pendulumB.transform.rotation);
         AddVectorObs(rbB.angularVelocity);
         AddVectorObs(rbB.velocity);