Metada project

1. run DataCleaner.java to move data from paper collection to paper_clean collection
2. remove aaai in paper_clean collection.

   db.papers_clean.remove({"venue":"AAAI"})
   

3. run KeywordsExtractor.java to generate keywords for papers without them originally.
4. run ReferenceMatcher.java in order to add the authors to each paper who cite the paper.
5. run NetworksGenerator.java to generate input for EvoClusNet algorithm
6. run EvoClusNet\Program.cs for EvoClusNet algorithm