update travis-ci java builders.
update travis-ci java builders.

drop oraclejdk6 as they no longer support it.
add oraclejdk7 and openjdk7.

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