Update charted to 0.4.8 and roll

packages/quiver/test/async/all_tests.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 library quiver.async.all_tests;
 
+import 'collect_test.dart' as collect;
+import 'concat_test.dart' as concat;
 import 'countdown_timer_test.dart' as countdown_timer;
 import 'create_timer_test.dart' as create_timer;
+import 'enumerate_test.dart' as enumerate;
 import 'future_group_test.dart' as future_group;
 import 'future_stream_test.dart' as future_stream;
 import 'iteration_test.dart' as iteration;
 import 'metronome_test.dart' as metronome;
+import 'stream_buffer_test.dart' as stream_buffer;
 import 'stream_router_test.dart' as stream_router;
 
 main() {
+  collect.main();
+  concat.main();
   countdown_timer.main();
   create_timer.main();
+  enumerate.main();
   future_group.main();
   future_stream.main();
   metronome.main();
   iteration.main();
+  stream_buffer.main();
   stream_router.main();
 }