Created permanent_ids controller and show route
change message text; closes #1133
Merge pull request #1139 from duke-libraries/perm-id-route

Created permanent_ids controller and show route
Merge pull request #1140 from duke-libraries/1133-permissions-text

change message text; closes #1133
Thumbnail deleted if updated content is not thumbnailable (fixes #1132)
Merge pull request #1141 from duke-libraries/1132-thumbnail-not-updating

Thumbnail deleted if updated content is not thumbnailable (fixes #1132)
set version to 3.0.0.rc1
set descMetadata download extension to .txt; closes #1125