Add in indexing of the EAD structure referenced from MODS.
Explicitly declare encoder.

Seemed to find it due to being available from the "parent", but anyway?
Index the children elements of our relatedItem element.
Add field for component IDs, normalize container field names.
Merge pull request #51 from adam-vessey/7.x-UCLA-15

Add in indexing of the EAD structure referenced from MODS.