Validation Report

This is now out-of-date: please see "Validation Report (revised)" below

Validation Report
  - Update IndexService to get missing field data from Solr
  - Model, controller, routes, and basic views for ValidationReport
  - Rake task to index sample invalid aggregation into Solr
If I can figure out how to do this by setting `config.show.route` then I won't have to override `UrlHelperBehavior`, which would be better.  Alas, I have not yet solved a problem related to route tracking that is getting in the way of the `config.show.route` option, but I will keep working on it as I move forward with other reports.