Linked Data Fragments/Sufia Integration

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ActiveTriples/linked-data-fragments should give us a fair bit of what we need, but should be refactored from a standalone rails app into something mountable in an existing Sufia application.

There is an existing ticket for this, here: ActiveTriples/linked-data-fragments#8, but I am inclined to avoid a full Rails Engine, and refactor the existing code into something lighter (e.g. mountable Rack middleware).

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I'm starting work on bridging these two projects at https://github.com/no-reply/qa-ldf

The basic idea is to provide a Qa::Authorities implementation specific to LDF. Most of the specialized stuff should be in configuration and/or optimizations. See also @elrayle's earlier work at: samvera/questioning_authority#109

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ActiveTriples/linked-data-fragments#43

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Dataset work is finished, as described in ActiveTriples/linked-data-fragments#43 (comment).

#all and #search still remain.

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Search is now implemented as a generic search service interface, via: curationexperts/qa-ldf#10

Search still doesn't exist on the LDF side, though, so until we've finished that, the default search service is EmptySearchService which returns an empty result set for all queries.