set travis environment to use scala 2.11.6
set travis environment to use scala 2.11.6

wandoulabs/chana,hustnn/chana,matthewtt/chana,wandoulabs/chana,matthewtt/chana,hustnn/chana,wandoulabs/chana,wandoulabs/chana,hustnn/chana,hustnn/chana,matthewtt/chana,matthewtt/chana