Travis: add 2.2.2 to the build matrix, use new container-based infrastructure
Travis: add 2.2.2 to the build matrix, use new container-based
infrastructure

Aupajo/middleman-search_engine_sitemap,angeloashmore/middleman-search_engine_sitemap,Aupajo/middleman-search_engine_sitemap,angeloashmore/middleman-search_engine_sitemap