Enable RSpec/IteratedExpectation cop and fix issues

Suggested refactor is only available for `.to` and not for `.not_to` :(

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/IteratedExpectation

.rubocop.yml

@@ -108,4 +108,7 @@ RSpec/InvalidPredicateMatcher:
   Enabled: true
 
 RSpec/ItBehavesLike:
+  Enabled: true
+
+RSpec/IteratedExpectation:
   Enabled: true

spec/features/moderation/comments_spec.rb

@@ -90,9 +90,7 @@ feature 'Moderate comments' do
 
         within('.js-check') { click_on 'All' }
 
-        all('input[type=checkbox]').each do |checkbox|
+        expect(all('input[type=checkbox]')).to all(be_checked)
-          expect(checkbox).to be_checked
-        end
 
         within('.js-check') { click_on 'None' }
 

spec/features/moderation/debates_spec.rb

@@ -99,9 +99,7 @@ feature 'Moderate debates' do
 
         within('.js-check') { click_on 'All' }
 
-        all('input[type=checkbox]').each do |checkbox|
+        expect(all('input[type=checkbox]')).to all(be_checked)
-          expect(checkbox).to be_checked
-        end
 
         within('.js-check') { click_on 'None' }
 

spec/features/moderation/proposals_spec.rb

@@ -99,9 +99,7 @@ feature 'Moderate proposals' do
 
         within('.js-check') { click_on 'All' }
 
-        all('input[type=checkbox]').each do |checkbox|
+        expect(all('input[type=checkbox]')).to all(be_checked)
-          expect(checkbox).to be_checked
-        end
 
         within('.js-check') { click_on 'None' }