Merge branch 'release/0.5.0' into develop

* release/0.5.0:
  Documentation update
  Increase version number
Prepare for new development
Convert JSONArray objects to ArrayList

The other CAS MetadataPopulators use String and ArrayList objects for
attribute values.  Updated TokenAttributes to follow that standard.
Update POM for releasing package in the Sonatype repo
Documentation updates
Version bump
Merge branch 'release/0.6.0'

* release/0.6.0:
  Version bump
  Documentation updates
  Update POM for releasing package in the Sonatype repo
  Convert JSONArray objects to ArrayList
  Prepare for new development