Various dls and semantic widget improvements

Added DLS functionality for loading a list of rules, and rule details
Updated markings widget to use a derived_from relationship, linking
graphs to the content they were implied by
Added CSS styles for triple/sparql widgets
Completed sparqlbar, sparqlresults, entityfacts widgets
Completed working sample allowing an entityfacts widget to display the
list of documents the graphs were defined from in a standard
searchresults content results widget.
Version bump for npm
Rebuilt docs and binaries
Last new functionality release before end of June