Use new Shutterbug client library and jpeg compression

[#84073916]

Note that //snapshot.concord.org/shutterbug uses still old
Shutterbug service that does not support JPEG compression.
It will become visible when this server is updated.
Update db/schema.rb

Perhaps someone forgot to commit it while creating recent migrations.
Confirm message for deleting an iframe interactive[#83765524].

- Add a confirmation when deleting an ifame interative with save_state checked.
Merge 'staging' into production shutterbug ~> 0.5.2