Add new method for getting all DOIs of a document

Method: DocumentDAO.getAllDOIs()
Remove test that is currently useless
Formatting XML
Bugfix: Remove spurious superclass this reference
Add experimental API test
Implement unit tests demonstrating how to use the SeerSuite API

 - I also added some convenience methods
Rewrite readme file
Update README.md
Resolved conflicting dependencies
Merge branch 'hotfix/missing_public_dependencies'