Add CAS integration
Created by: rotated8
Fix configs for "production" Solr, Blacklight.
Also update Gemfile.lock, because there's a new version of Bundler.
Trailing slash in CAS url produced errors. (The slash is auto added by omniauth-cas)
Change field assignments from CAS
Allows the application to create users by providing a legitimate email address.
Use custom omniauth callbacks controller.