Enable RSpec/NotToNot cop and fix all issues

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

spec/support/common_actions.rb

@@ -141,7 +141,7 @@ module CommonActions
   end
 
   def expect_to_not_be_signed_in
-    expect(find('.top-bar')).to_not have_content 'My account'
+    expect(find('.top-bar')).not_to have_content 'My account'
   end
 
   def select_date(values, selector)
@@ -210,12 +210,12 @@ module CommonActions
 
   def expect_message_voting_not_allowed
     expect(page).to have_content 'Voting phase is closed'
-    expect(page).to_not have_selector('.in-favor a')
+    expect(page).not_to have_selector('.in-favor a')
   end
 
   def expect_message_selecting_not_allowed
     expect(page).to have_content 'No Selecting Allowed'
-    expect(page).to_not have_selector('.in-favor a')
+    expect(page).not_to have_selector('.in-favor a')
   end
 
   def expect_message_organizations_cannot_vote
@@ -297,8 +297,8 @@ module CommonActions
 
   def expect_no_badge_for(resource_name, resource)
     within("##{resource_name}_#{resource.id}") do
-      expect(page).to_not have_css ".label.round"
-      expect(page).to_not have_content "Employee"
+      expect(page).not_to have_css ".label.round"
+      expect(page).not_to have_content "Employee"
     end
   end
 
@@ -314,7 +314,7 @@ module CommonActions
 
     within("#poll_question_#{question.id}_answers") do
       click_link answer.to_s
-      expect(page).to_not have_link(answer.to_s)
+      expect(page).not_to have_link(answer.to_s)
     end
   end