Add support for Linux Mint
Add support for Linux Mint

Add support for Linux Mint, tested on Linux Mint 17, but it should work for
other versions too.

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