Move ClampedSimulation into newton

ClampedSimulation makes more sense at the newton layer because it's dealing
entirely with newton concepts.

packages/flutter/lib/animation.dart

@@ -10,7 +10,6 @@ library animation;
 export 'src/animation/animation.dart';
 export 'src/animation/animation_controller.dart';
 export 'src/animation/animations.dart';
-export 'src/animation/clamped_simulation.dart';
 export 'src/animation/curves.dart';
 export 'src/animation/forces.dart';
 export 'src/animation/listener_helpers.dart';

packages/newton/lib/newton.dart

-// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -12,6 +12,7 @@ part 'src/simulation_group.dart';
 part 'src/tolerance.dart';
 part 'src/utils.dart';
 
+part 'src/clamped_simulation.dart';
 part 'src/friction_simulation.dart';
 part 'src/gravity_simulation.dart';
 part 'src/scroll_simulation.dart';

packages/flutter/lib/src/animation/clamped_simulation.dart → packages/newton/lib/src/clamped_simulation.dart

-// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:newton/newton.dart';
+part of newton;
 
 class ClampedSimulation extends Simulation {
   ClampedSimulation(this.simulation, {