0.10.0
* Store last_eventful_visit_date
* journal_client: Store last revision/release date
* elasticsearch.py: Improve readability of painless script
* origin_search: Add sort_by feature
* origin_search: Filter for instrinsic_metadata language and license
* origin_search: Add keyword search for instrinsic_metadata keywords/description
* origin_search: Filters and sorting for date_{created,modified,published}