DEV: Rails 5.2 upgrade and global gem upgrade

This updates tests to use latest rails 5 practice
and updates ALL dependencies that could be updated

Performance testing shows that performance has not regressed
if anything it is marginally faster now.

app/controllers/application_controller.rb

@@ -96,7 +96,8 @@ class ApplicationController < ActionController::Base
 
   def dont_cache_page
     if !response.headers["Cache-Control"] && response.cache_control.blank?
-      response.headers["Cache-Control"] = "no-store, must-revalidate, no-cache, private"
+      response.cache_control[:no_cache] = true
+      response.cache_control[:extras] = ["no-store"]
     end
   end