Adding goals for v0.2
Introducing Document as a generalization of Paper
Minor revision of PaperImpl
Adopting Java 1.8
Revising PaperImpl
Generalizing getPapers in getDocuments
Moving Paper specific code from dataset to dataset.paper package
Clean up PapersDirLoadingStrategy
Moving DbPediaBatchStorer.java among the experiment specific files
Commenting DbPediaFacade
Minor corrections