Update to hyrax 2.1.0.rc2

[elrayle]

PRs addressing nurax issues... PR #2981 (backport PR #3003) - display number of collections in repository in collection list pages (nurax#275) PR #3002 (backport PR #3032) - better messages about collection counts in the repository (related to nurax#275) PR #3026 (backport PR #3033) - message to display work count in repository (related to nurax#275) PR #2971 (backport PR #2972) - Hide UniversalViewer when representative isn't an image (nurax#273) PR #3007 (backport PR #3022) - Add popstate event handler to cover the case where the browser history (nurax#272) PR #3001 (backport PR #3021) - Remove collection id from delete collection confirmation modal (nurax#271) PR #3011 (backport PR #3023) - Hide "remove" button when user is a viewer of the current collection (nurax#255) PR #2986 (backport PR #2993) - update text in manage proxy page. (nurax#248) PR #2990 (backport PR #2998) - Fix collection thumbnail selection (nurax#231)

Other PRs... PR #2970 (backport PR #2991) - Improve on German language (native Speaker) hyrax2.1.0rc1 PR #2995 - change default badge color for admin set and user collection PR #3027 (backport PR #3044) - Change radio buttons into autocomplete field for add works to collection model PR #3005 (backport PR #3012) - Code cleanup PR #2956 (backport PR #3013) - Fix workflow.activate! PR #3014 (backport PR #3020) - Update Rails/Fedora/Solr versions recommended in README PR #2999 (backport PR #3019) - Update the README.md to point to the :test adapter PR #2994 (backport PR #3017) - Update link for YARD example in Contributing doc. PR #3004 (backport PR #3016) - Fix Hyrax::FileSetFixityCheckService bug when fileset contains non-ve… PR #2975 (backport PR #3015) - appends collection_type_id to existing or non-existent querystring PR #2947 (backport PR #3028) - Refactor UpdateCollectionTypeColumnOptions migration template to make… PR #2962 (backport PR #3018) - Update hydra-editor requirement to >= 3.3, < 5.0