Explicitly require forwardable

Sunspot needs it in version 2.0.  Not sure why they aren't
including it though.
config/document_cloud.yml contains ERB

newer editions of YAML throw exceptions when attempting to parse it due
to the erb markup being non-valid YAML
Updated db:structure:dump

This will make migrations run faster and skip old ones that can no
longer be applied cleanly
Remove obsolete MetadataDate migration

The MetadataDate relationship no longer exists.  Migration causes errors
due to the missing class.
bump version to latest
Un-expired self signed keys