WPS Cleanup

[ZachCMP]

• [x] Update fixtures to include about page (about-wps)
• [x] Update fixtures to include global tool as a top-level item with map inside of it
• [x] Add news page to fixtures (news-and-publications)
• [x] Add archive page to fixtures (news-archive)
• [x] Add image variants for new banner image
• [x] Ensure test coverage

[ZachCMP]

Test Coverage

• [x] controllers/root_controller
• [x] controllers/admin/news_item_controller
• [x] models/news_item_test
• [x] system/admin/news_items_test
• [x] models/page_test
• [x] Add system/news
  • Test load
  • Make sure it has news items on it
  • Make sure it works if no news items exist
  • Make sure the link works
• [x] Add system/archive
  • Test load
  • Make sure it works if no news items exist
  • Make sure it only loads categories that exist
  • Make sure it loads news items into the right categories