Merge pull request #1 from daalft/david-dev

Merged dev into master.
Merge branch 'david-dev'
General update.
Created Polaris.
Added data folder.
Created stopwords utility class.
Added polariseable interface.
Changed default Polaris file path.
Added toString method.
Added toString method.
Updated Entity.
Added polariseable interface and toString.
Added stopword filtering functionality.