replaces reference to DJ in README with a reference to resque-pool
replaces reference to DJ in README with a reference to resque-pool

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