Remove openjdk6 from travis test matrix
Remove openjdk6 from travis test matrix

the cassandra 2.0 maven crashes when run against java 6.

goru97/blueflood,VinnyQ/blueflood,GeorgeJahad/blueflood,ChandraAddala/blueflood,chinmay-gupte/blueflood,GeorgeJahad/blueflood,rackerlabs/blueflood,goru97/blueflood,GeorgeJahad/blueflood,ChandraAddala/blueflood,btravers/blueflood,shintasmith/blueflood,menchauser/blueflood,izrik/blueflood,menchauser/blueflood,rackerlabs/blueflood,shintasmith/blueflood,VinnyQ/blueflood,goru97/blueflood,tilogaat/blueflood,ChandraAddala/blueflood,menchauser/blueflood,chinmay-gupte/blueflood,menchauser/blueflood,shintasmith/blueflood,VinnyQ/blueflood,chinmay-gupte/blueflood,btravers/blueflood,tilogaat/blueflood,VinnyQ/blueflood,rackerlabs/blueflood,ChandraAddala/blueflood,shintasmith/blueflood,ChandraAddala/blueflood,izrik/blueflood,tilogaat/blueflood,VinnyQ/blueflood,izrik/blueflood,izrik/blueflood,GeorgeJahad/blueflood,rackerlabs/blueflood,tilogaat/blueflood,tilogaat/blueflood,shintasmith/blueflood,shintasmith/blueflood,VinnyQ/blueflood,GeorgeJahad/blueflood,chinmay-gupte/blueflood,menchauser/blueflood,izrik/blueflood,izrik/blueflood,btravers/blueflood,goru97/blueflood,goru97/blueflood,chinmay-gupte/blueflood,btravers/blueflood,rackerlabs/blueflood,goru97/blueflood,rackerlabs/blueflood,btravers/blueflood,ChandraAddala/blueflood