Add openseadragon-rails as a gem dependency

[cgalarza]

The openseadragon-rails gem has been archived on github. I could not find another repository for the gem.

Is it safe to remove openseadragon-rails in blacklight-gallery v6? We aren't entirely sure of the functionality it provided.

[cgalarza]

It looks like this is the more up-to date github repo? https://github.com/sul-dlss/openseadragon-rails

[jcoyne]

@cgalarza that is correct. https://github.com/sul-dlss/openseadragon-rails is the official repo. rubygems.org is not showing the right link due to this bug: rubygems/rubygems.org#5544

[cgalarza]

Thanks for confirming! There's no issue tab for the project, is that intentional?

It looks like openseadragon-rails is embedded in this gem and might prove difficult to separate the functionality. I think its misleading that this gem depends on openseadragon-rails, but it is a not a dependency of this gem in the gemspec. This is probably because its installed by the generator. I'd advocate for making openseadragon-rails a dependency of this project. This means we wouldn't need to add the openseadragon-rails gem as part of the installer and could continue to run the openseadragon-rails installer.