Added poll questions documents and video specs

New tests to ensure video URL is shown in the admin preview. Also that the video URL and documents are correctly saved after creating a question.

spec/features/admin/poll/questions_spec.rb

@@ -38,6 +38,7 @@ feature 'Admin poll questions' do
       Pursued by the Empire's sinister agents, Princess Leia races home aboard her starship, custodian of the stolen plans that can save her
        people and restore freedom to the galaxy....
     }
+    video_url = "https://puppyvideos.com"
 
     visit admin_questions_path
     click_link "Create question"
@@ -45,11 +46,13 @@ feature 'Admin poll questions' do
     select 'Movies', from: 'poll_question_poll_id'
     fill_in 'poll_question_title', with: title
     fill_in 'poll_question_description', with: description
+    fill_in 'poll_question_video_url', with: video_url
 
     click_button 'Save'
 
     expect(page).to have_content(title)
     expect(page).to have_content(description)
+    expect(page).to have_content(video_url)
   end
 
   scenario 'Create from successful proposal index' do