Redo StreamTransformers so they work with Stack traces.

Since this involved a breaking change I cleaned up more of the
StreamTransformer API.

This CL also deprecates the getAttachedStackTrace method.,,,

Review URL:

git-svn-id: 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 8e056ade33ad886f79e97acedd31cd23137614bd
  2. lib/
  3. pubspec.yaml
  4. test/

A Unicode manipulation library for Dart.

The utf package provides common operations for manipulating Unicode sequences. In its initial form it is a copy of the dart:utf library before that was deprecated.