Release v0.1.1

citeme 0.1.1

• Add publisher field to org_item class with role "pbl" (#6).
  Similar to funder, this allows organisations to specify publisher
  requirements.
• Add which_publisher and get_default_publisher active bindings to
  org_list.
• Update validate_rules() to validate publisher requirements.
• Update citation_description.R to include publisher in community detection.
• Update yaml_individual() to handle publisher entries from YAML metadata.