Add travis-ci build script. (cherry picked from commit cfe357a546669c3ca70ee1f65dbc5034c2be4760)
Add travis-ci build script.
(cherry picked from commit cfe357a546669c3ca70ee1f65dbc5034c2be4760)

0xPoly/ooni-probe,0xPoly/ooni-probe,0xPoly/ooni-probe,Karthikeyan-kkk/ooni-probe,0xPoly/ooni-probe,Karthikeyan-kkk/ooni-probe,juga0/ooni-probe,lordappsec/ooni-probe,kdmurray91/ooni-probe,kdmurray91/ooni-probe,lordappsec/ooni-probe,kdmurray91/ooni-probe,kdmurray91/ooni-probe,lordappsec/ooni-probe,lordappsec/ooni-probe,Karthikeyan-kkk/ooni-probe,juga0/ooni-probe,juga0/ooni-probe,juga0/ooni-probe,Karthikeyan-kkk/ooni-probe