Use system specs instead of feature specs

We get rid of database cleaner, and JavaScript tests are faster because
between tests we now rollback transactions instead of truncating the
database.

spec/system/admin/poll/questions/answers/answers_spec.rb

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+require "rails_helper"
+
+describe "Answers" do
+  before do
+    admin = create(:administrator)
+    login_as admin.user
+  end
+
+  scenario "Create" do
+    question = create(:poll_question)
+
+    visit admin_question_path(question)
+    click_link "Add answer"
+
+    fill_in "Answer", with: "The answer is always 42"
+    fill_in "Description", with: "The Hitchhiker's Guide To The Universe"
+
+    click_button "Save"
+
+    expect(page).to have_content "The answer is always 42"
+    expect(page).to have_content "The Hitchhiker's Guide To The Universe"
+  end
+
+  scenario "Create second answer and place after the first one" do
+    question = create(:poll_question)
+    create(:poll_question_answer, title: "First", question: question, given_order: 1)
+
+    visit admin_question_path(question)
+    click_link "Add answer"
+
+    fill_in "Answer", with: "Second"
+    fill_in "Description", with: "Description"
+
+    click_button "Save"
+
+    expect("First").to appear_before("Second")
+  end
+
+  scenario "Update" do
+    question = create(:poll_question)
+    answer = create(:poll_question_answer, question: question, title: "Answer title", given_order: 2)
+    create(:poll_question_answer, question: question, title: "Another title", given_order: 1)
+
+    visit admin_answer_path(answer)
+
+    click_link "Edit answer"
+
+    fill_in "Answer", with: "New title"
+
+    click_button "Save"
+
+    expect(page).to have_content "Changes saved"
+    expect(page).to have_content "New title"
+
+    visit admin_question_path(question)
+
+    expect(page).not_to have_content "Answer title"
+
+    expect("Another title").to appear_before("New title")
+  end
+end