[SidJnsn]

* Adds back OCLC-Worldcat and LCCN. These are obtained from the same LOC-SRU API. This currently works only for the ISBN lookup and not for Author/Title. The LCCN is not currently normalized for author lookup. Hope to get to those soon.

* If two books match a single ISBN, the plugin will now return nothing. Previously, it was returning the first title, which could be incorrect. Running the author/title query for these will get the correct data. I hope to change this to do a basic check on ISBN lookup to see if a title can be matched.