one bug fix:
- fix minor bug in rights parsing for indexing (treat empty
<machine/>stanza like<machine><none/></machine>)
small functional enhancements:
- add a convenience method (
#dark?) to see whether the rights metadata of an object indicates that it is dark as a whole - add
#citation_only?method (analogous to#dark?)
minor maintenance:
- minor spec refactoring
- Add ruby 2.5.3 to travis build
- remove obsolete ruby version from travis build list (2.1.2)
- Enable caching and disable compiling libxml for faster builds
- Update how we send test metrics to codeclimate
- Remove gemnasium badge