Update travis config to perform a release build.
Update travis config to perform a release build.

hansjoachim/fitnesse,rbevers/fitnesse,hansjoachim/fitnesse,rbevers/fitnesse,amolenaar/fitnesse,amolenaar/fitnesse,amolenaar/fitnesse,rbevers/fitnesse,jdufner/fitnesse,hansjoachim/fitnesse,jdufner/fitnesse,jdufner/fitnesse