Fix stream transformation

Constructor name change in async StreamTransformer
Strips missing js methods

The release, retain, and callback creation methods seem to be missing.

Just get no such method errors when using it, however the API still
indicates they are present. When I look at:

https://github.com/dart-lang/js-interop/blob/master/lib/js.dart

I see no such methods so they have been removed. The example works once
again.

The release method will be retained for backwards compatability but the
README and other docs will be updated.
Updates comments, docs regarding changes

Have added big note to myself for the future. I expect to be wrong about
this.
Merge branch 'feature/dart-0.8.7.0' into develop

Many thanks to N.Thillai Arasu for alerting me to this issue.
Increase version
Merge branch 'release/0.0.6' into develop