Validaiton Report

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
I was following the example here:  http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201006.mbox/%3C5B4ACE43-845C-4B37-86AA-CCF04F09DE4D@mac.com%3E  
I can experiment and see what happens if I change or remove the `facet.mincount` param.