Initial setup of jstree stuff.

Still need to be able to allow the selection/verification/etc of
an actual container within the given component.
Allow selection of containers, disallow selection of components.
Wired up.
Make Solr optional.
Add blurb about jstree to README.
Fix ingest step usage.
Stop lying in a comment.
Merge pull request #10 from adam-vessey/7.x-UCLA-14

UCLA-14: Manuscript -> Finding aid references