Bumped version to 0.2.1
Update README.md
Update README.md
Polished the API
Added an adapter registry
Added a no-op adapter for testing
Merge pull request #3 from duke-libraries/polish-api

Polished the API
Added Extractor factory method to top level module
Update README.md
Merge branch 'develop'
Bumped version to 0.3.0