Add CircleIO config.

Change-Id: Iabf095a5fffe2c64d35b614b4242315206be21f1
Add test output as an artifact
Merge pull request #6 from csmith/master

Attempt #3 at a CircleIO config.
Change feedback URL.

Change-Id: Id4f392b9e646eed8b90357974523772ae1b2b72e