add helper methods for covers
use covers in search results
ES index creation uses batches again
remove unneded test for PAs and wikipedia summaries
Merge branch 'new-design' into search_page

Conflicts:
	test/integration/protected_area_show_test.rb
add MAPBOX_ACCESS_TOKEN to .env.example
Merge branch 'new-design' into search_page

* new-design:
  fix active_token class variables
  Mocks search class
  Link to PA from map search results
  Show the Protected Areas on a map

Conflicts:
	app/views/search/index.html.erb
	test/helpers/search_helper_test.rb
Merge pull request #148 from unepwcmc/search_page

Search page