Roll Observatory packages and add a roll script

charted/lib/core/interpolators.dart

Index: charted/lib/core/interpolators.dart
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-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-/// A collection of interpolator generators and easing functions.
-/// 
-/// Interpolators provide intermediate state when transitioning from one
-/// frame to another in an animation.
-/// 
-/// Easing functions indicate progress of an animation to interpolators. 
-/// 
-/// Currently provides interpolator for various types, including basic types
-/// like numbers, colors, strings, transforms and for iterables.
-library charted.core.interpolators;
-
-import 'dart:math' as math;
-import 'package:charted/core/utils.dart';
-
-part 'interpolators/interpolators.dart';
-part 'interpolators/easing.dart';