updates Gemfile.lock to use latest nokogiri & rdf helper libraries
updates Gemfile.lock to use latest nokogiri & rdf helper libraries

samvera/hyrax,ndlib/scholarsphere,jeremyf/sufia,samvera/hyrax,ndlib/scholarsphere,zhang4952/scholarsphere,jeremyf/sufia,samvera/hyrax,zhang4952/scholarsphere,ndlib/scholarsphere,samvera/hyrax,zhang4952/scholarsphere,zhang4952/scholarsphere