Revert "reverted travis.yml to just run unit tests"
Revert "reverted travis.yml to just run unit tests"

This reverts commit 06e81b58e1b3c73ee9b61b3aeda6a8f5737baf07.

mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream,mark-in/securedrop-prov-upstream