The `async` package will contain tools to work with asynchronous computations.

The package contains sub-libraries with different utilities.

### Zipping streams

The "stream_zip.dart" sub-library contains functionality to combine several streams
of events into a single stream of tuples of events.

### History.
This package is unrelated to the discontinued `async` package with version 0.1.17.

The `async` package will contain tools to work with asynchronous computations.

The package contains sub-libraries with different utilities.

### Zipping streams

The "stream_zip.dart" sub-library contains functionality to combine several streams
of events into a single stream of tuples of events.

### History.
This package is unrelated to the discontinued `async` package with version 0.1.7.

Fix incorrect reference to previous version of async library.
Fix incorrect reference to previous version of async library.

R=sgjesse@google.com

Review URL: https://codereview.chromium.org//119223002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@31274 260f80e4-7a28-3924-810f-c04153c831b5
