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.

spec/controllers/composer_messages_controller_spec.rb

@@ -15,7 +15,7 @@ describe ComposerMessagesController do
 
       it 'redirects to your user preferences' do
         get :index, format: :json
-        expect(response).to be_success
+        expect(response).to be_successful
       end
 
       it 'delegates args to the finder' do