Update copyright years?
Merge pull request #9 from kant/patch-1

Update copyright years?
Enlarged search of basic elements of Dublin Core to their refinements, if any.
Added an option to enlarge or not the advanced search to refinements.
Enlarged sort of basic elements of Dublin Core to their refinements, if any.
Simplified the build of the query used to enlarge advanced search to refinements.
Fixed the hook to sort items.