adding before_install step as per https://github.com/travis-ci/travis-ci/issues/3531
adding before_install step as per https://github.com/travis-ci/travis-ci/issues/3531

natritmeyer/site_prism,irfanah/site_prism,irfanah/site_prism,benlovell/site_prism,natritmeyer/site_prism,tgaff/site_prism,tgaff/site_prism,benlovell/site_prism