Allow changelog to be in both PyPI view and in the documentation.
Merge README into documentation so basic information is included in the
latter and to reduce duplication.
Fix wrong path to news file.
Merge pull request #50 from itamarst/improved-readme-41-33

Merge README into the documentation

Fixes #41
Fixes #33
Merge remote-tracking branch 'refs/remotes/origin/master' into unit-testing-39
Document the newly exposed testing API.