HYDRASIR-36 Display Creative Commons licenses or similar license terms that submitter has selected

 1. Added a line to the _attributes.html.erb partials to display the rights (i.e. content license).
 2. Modified the curate_helper.rb curation_concern_attribute_to_html method to perform special handling of the :rights attribute.  That special handling involves coding an anchor link which opens in a separate tab if the :rights metadata is a url.  Otherwise, the text name of the license is displayed rather than a link.
Merge pull request #447 from projecthydra/feature/HYDRASIR-36_Display_Creative_Commons_licenses_or_similar_license_terms_that_submitter_has_selected

HYDRASIR-36 Display Creative Commons licenses or similar license terms t...