Implement consistent admin interface

* Consistent route/model/controller/view layout
* Get rid of unused photos, speakers, dietchoices, social_events controllers
* Drop unused :public from Rooms and :description from CallForPapers

spec/features/difficulty_levels_spec.rb

@@ -6,47 +6,47 @@ feature DifficultyLevel do
   let!(:organizer) { create(:user, role_ids: [organizer_role.id]) }
 
   shared_examples 'difficulty levels' do
-    scenario 'adds and updates difficulty level', feature: true, js: true do
+    scenario 'adds difficulty level', feature: true, js: true do
 
       sign_in organizer
       visit admin_conference_difficulty_levels_path(
                 conference_id: conference.short_title)
 
       # Add difficulty level
-      click_link 'Add difficulty_level'
-      expect(page.all('div.nested-fields').count == 1).to be true
+      click_link 'Add Difficulty Level'
 
-      page.
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(1) input').
-          set('Example difficulty level')
-      page.
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(2) textarea').
-          set('Example difficulty level description')
-      page.
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(3) input').
-          set('#ff0000')
+      fill_in 'difficulty_level_title', with: 'Hard'
+      fill_in 'difficulty_level_description', with: 'Life is the hardest'
+      page.find('#difficulty_level_color').set('#ff0000')
 
-      click_button 'Update Conference'
+      click_button 'Create Difficulty level'
 
       # Validations
-      expect(flash).to eq('Difficulty Levels were successfully updated.')
-      expect(
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(1) input').
-                 value).to eq('Example difficulty level')
-      expect(
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(2) textarea').
-                 value).to eq('Example difficulty level description')
-      expect(
-          find('div.nested-fields:nth-of-type(1) div:nth-of-type(3) input').
-                 value).to eq('#ff0000')
+      expect(flash).to eq('Difficulty level successfully created.')
+      within('table#difficulty_levels') do
+        expect(page.has_content?('Hard')).to be true
+        expect(page.has_content?('Life is the hardest')).to be true
+        expect(page.assert_selector('tr', count: 2)).to be true
+      end
+    end
+
+    scenario 'updates difficulty level', feature: true, js: true do
+
+      conference.difficulty_levels << create(:difficulty_level)
+      sign_in organizer
+      visit admin_conference_difficulty_levels_path(
+                conference_id: conference.short_title)
 
       # Remove difficulty level
-      click_link 'Remove difficulty_level'
-      expect(page.all('div.nested-fields').count == 0).to be true
-      click_button 'Update Conference'
-      expect(flash).to eq('Difficulty Levels were successfully updated.')
-      expect(page.all('div.nested-fields').count == 0).to be true
+      click_link 'Delete'
+
+      # Validations
+      expect(flash).to eq('Difficulty level successfully deleted.')
+      within('table#difficulty_levels') do
+        expect(page.assert_selector('tr', count: 1)).to be true
+      end
     end
+
   end
 
   describe 'organizer' do