Update charted to 0.4.8 and roll

packages/observable/lib/src/to_observable.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library observe.src.to_observable;
+library observable.src.to_observable;
 
-import 'package:observe/observe.dart';
+import 'observable.dart' show Observable;
+import 'observable_list.dart' show ObservableList;
+import 'observable_map.dart' show ObservableMap;
 
 /// Converts the [Iterable] or [Map] to an [ObservableList] or [ObservableMap],
 /// respectively. This is a convenience function to make it easier to convert
 /// literals into the corresponding observable collection type.
 ///
 /// If [value] is not one of those collection types, or is already [Observable],
 /// it will be returned unmodified.
 ///
 /// If [value] is a [Map], the resulting value will use the appropriate kind of
 /// backing map: either [HashMap], [LinkedHashMap], or [SplayTreeMap].
 ///
 /// By default this performs a deep conversion, but you can set [deep] to false
 /// for a shallow conversion. This does not handle circular data structures.
 /// If a conversion is peformed, mutations are only observed to the result of
 /// this function. Changing the original collection will not affect it.
 // TODO(jmesserly): ObservableSet?
-toObservable(value, {bool deep: true}) =>
+toObservable(dynamic value, {bool deep: true}) =>
     deep ? _toObservableDeep(value) : _toObservableShallow(value);
 
-_toObservableShallow(value) {
+dynamic _toObservableShallow(dynamic value) {
   if (value is Observable) return value;
   if (value is Map) return new ObservableMap.from(value);
   if (value is Iterable) return new ObservableList.from(value);
   return value;
 }
 
-_toObservableDeep(value) {
+dynamic _toObservableDeep(dynamic value) {
   if (value is Observable) return value;
   if (value is Map) {
     var result = new ObservableMap.createFromType(value);
     value.forEach((k, v) {
       result[_toObservableDeep(k)] = _toObservableDeep(v);
     });
     return result;
   }
   if (value is Iterable) {
     return new ObservableList.from(value.map(_toObservableDeep));
   }
   return value;
 }