Install OpenJDK 6 on Travis
Install OpenJDK 6 on Travis

Travis switched from Ubuntu Precise images to Ubuntu Trusty images. The
Trusty images don't have installed OpenJDK 6 by default. See
travis-ci/travis-ci#8199

junit-team/junit,ashleyfrieze/junit,ashleyfrieze/junit,junit-team/junit4,junit-team/junit4,panchenko/junit,ashleyfrieze/junit,panchenko/junit,kcooney/junit,junit-team/junit4,alb-i986/junit,junit-team/junit,kcooney/junit,stefanbirkner/junit,alb-i986/junit,junit-team/junit,stefanbirkner/junit,kcooney/junit,stefanbirkner/junit,alb-i986/junit,panchenko/junit