Delegate Capybara::Result#to_ary

[seanpdoyle]

Delegate to Capybara::Result#full_results in order to support Ruby's multiple assignment:

node = Capybara.string <<~HTML
  <ul>
    <li>Alpha</li>
    <li>Beta</li>
    <li>Gamma</li>
    <li>Delta</li>
  </ul>
HTML

first, *rest, last = node.all("//li", minimum: 0)

expect(first).to have_text "Alpha"
expect(rest.first).to have_text "Beta"
expect(rest.last).to have_text "Gamma"
expect(last).to have_text "Delta"