Merge pull request #1198 from duke-libraries/1190-download-url-hotfix

Established /download route (fixes #1190)
Bumped version to 3.0.2
Removed helpers to get associated documents.
Created related_objects partial is each repository model controller to display related objects.
Removed generic related_object partial from application views.
Added i18n for is_external_target_for association.
Added find_parent method to HasParentBehavior controller concern to permit the `parent' method to work for all views.
Fixes #1206
Merge branch 'hotfix-1206' into develop

Conflicts:
	lib/dul_hydra/version.rb