better collection listing on item registration page, other minor housekeeping

• RegistrationController#collection_list alpha-sorts (except for leading 'None' entry) (#995)
• prevent RegistrationController#collection_list from returning entries for collections that don't exist in fedora (#996)
• Fix typo in catalog controller (#998)
• update obsolete rubocop configs, and related fixes (incl some style cleanup). jshint config fixups. (#992)