Adds a RIS citation tool for the Publication show page.

[bwatson78]

• app/controllers/concerns/hyrax/works_controller_behavior.rb: removes this full file override after moving the two methods overwritten to app/controllers/hyrax/publications_controller.rb.
• app/controllers/hyrax/publications_controller.rb: takes in overrides of #additional_response_formats and #permissions_changed? and creates #respond_to_ris that largely mimics Hyrax' #respond_to_endnote logic.
• app/models/concerns/self_deposit/ris_behavior.rb: initiates a module holding all of the logic needed to pull and process the necessary RIS text.
• app/models/solr_document.rb: includes the module referenced above.
• app/views/hyrax/base/_citations.html.erb: adds the link for RIS that is using the same format response processing as Endnote.
• config/initializers/mime_types.rb: adds .ris as an expected extension.
• spec/*: checks for link presence and correct RIS file processing.

[codeclimate]

Code Climate has analyzed commit f6c915f and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 88.7% (50% is the threshold).

This pull request will bring the total coverage in the repository to 78.8% (5.2% change).

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