prepare for multiple root annos

• upgrade to vanilla fedora 4.1.1
  ** will have pair-tree prefixes on LDP container uuids
• use rdf-vocab in place of sul-dlss rdf-xxx gems
• add rubocop
• prepare for multiple root annos
  ** add lpw_writer.container_exist?
  ** add ldp_writer.create_basic_container
  ** remove root_annotation_creator in favor of ldp_writer.create_basic_container