add link to new s3 documentation in the heroku deployment guide

Closes #5641
Validate uniqueness of OptionType#name. Fixes #5629
Validate uniqueness of OptionValue#name. Fixes #5630
Sequence factories for uniqueness. refs #5629
Bump Rails.
Indexing the guest_token column on spree_orders

Closes #5648
Namespace eligibility validator like the rest.
fix spec
Remove old file.