Remove unused class and references to it.
Actually remove the file.
Merge pull request #139 from jordandukart/7.x-LIB-28

Remove unused class and references to it.
Allow islandora_solr_metadata display for citation, thesis objects
Increase quality of PDF previews by controlling density used to generate images
Remove preview density setting when uninstalling module
Escape user-provided arguments to shell
Change islandora_scholar_preview_density default to match imagemagick defaults
Change typo for default preview density (75 -> 72)
Correct over-escaping of density argument