Persist OriginalRecord

This is a substantial rewrite of OriginalRecord to allow them to persist to LDP.
The `IndexService` module is autoloaded in `/krikri/lib/krikri.rb`.  Could `ldp/resource` be autoloaded in `/krikri/lib/krikri.rb` as well?  Or perhaps `IndexService` should be autoloaded in `/krikri/lib/indexservice.rb`?  Not sure which way is best, but it would be good to be consistent.