Use Travis' container-based infrastructure.
Use Travis' container-based infrastructure.

As described in http://docs.travis-ci.com/user/workers/container-based-infrastructure/, this would reduce build times.

PikachuEXE/bullet,flyerhzm/bullet,danp60/bullet,eileencodes/bullet,hannahbot/bullet,flyerhzm/bullet,rrosenblum/bullet,sho-h/brakefast,flyerhzm/bullet,yakovenkodenis/bullet,jay3126/bullet,theass/bullet,jay3126/bullet,PikachuEXE/bullet,yakovenkodenis/bullet,hannahbot/bullet,sho-h/brakefast,theass/bullet,rrosenblum/bullet,danp60/bullet,eileencodes/bullet