Case by case fixtures modify

[mejackreed]

Moves fixtures to specific directories.

JSON docs under spec/fixtures/solr_documents will be indexed for use in feature testing/development

JSON docs under spec/fixtures/test_cases could be used instead of creating json records in specific unit tests. For example see: https://github.com/geoblacklight/geoblacklight/blob/master/spec/lib/geoblacklight/references_spec.rb#L6

Instead of creating a a record for each of these tests, json files could be used or this could be included in a Ruby class. Creating ticket #227 for evaluating whether or not to do this

[coveralls]

Coverage remained the same when pulling 1ab867f on case-by-case-fixtures-modify into 5b35df3 on case-by-case-fixtures.

[mejackreed]

Also I removed the dct_references_generate and dct_references_spec as it seemed that these were out of date and could be managed now using the specific json files included as fixtures.