travis-ci: fix build failures on PRs / branches
travis-ci: fix build failures on PRs / branches

zzuegg/jmonkeyengine,d235j/jmonkeyengine,sandervdo/jmonkeyengine,d235j/jmonkeyengine,InShadow/jmonkeyengine,zzuegg/jmonkeyengine,bsmr-java/jmonkeyengine,bsmr-java/jmonkeyengine,rbottema/jmonkeyengine,zzuegg/jmonkeyengine,atomixnmc/jmonkeyengine,yetanotherindie/jMonkey-Engine,aaronang/jmonkeyengine,olafmaas/jmonkeyengine,davidB/jmonkeyengine,nickschot/jmonkeyengine,jMonkeyEngine/jmonkeyengine,wrvangeest/jmonkeyengine,delftsre/jmonkeyengine,wrvangeest/jmonkeyengine,phr00t/jmonkeyengine,Georgeto/jmonkeyengine,phr00t/jmonkeyengine,davidB/jmonkeyengine,olafmaas/jmonkeyengine,skapi1992/jmonkeyengine,bertleft/jmonkeyengine,sandervdo/jmonkeyengine,delftsre/jmonkeyengine,d235j/jmonkeyengine,aaronang/jmonkeyengine,aaronang/jmonkeyengine,Georgeto/jmonkeyengine,danteinforno/jmonkeyengine,atomixnmc/jmonkeyengine,GreenCubes/jmonkeyengine,GreenCubes/jmonkeyengine,wrvangeest/jmonkeyengine,olafmaas/jmonkeyengine,d235j/jmonkeyengine,bsmr-java/jmonkeyengine,nickschot/jmonkeyengine,yetanotherindie/jMonkey-Engine,rbottema/jmonkeyengine,bsmr-java/jmonkeyengine,bertleft/jmonkeyengine,zzuegg/jmonkeyengine,atomixnmc/jmonkeyengine,olafmaas/jmonkeyengine,davidB/jmonkeyengine,tr0k/jmonkeyengine,davidB/jmonkeyengine,danteinforno/jmonkeyengine,aaronang/jmonkeyengine,GreenCubes/jmonkeyengine,nickschot/jmonkeyengine,Georgeto/jmonkeyengine,nickschot/jmonkeyengine,delftsre/jmonkeyengine,Georgeto/jmonkeyengine,skapi1992/jmonkeyengine,bertleft/jmonkeyengine,sandervdo/jmonkeyengine,jMonkeyEngine/jmonkeyengine,phr00t/jmonkeyengine,phr00t/jmonkeyengine,atomixnmc/jmonkeyengine,jMonkeyEngine/jmonkeyengine,yetanotherindie/jMonkey-Engine,Georgeto/jmonkeyengine,danteinforno/jmonkeyengine,yetanotherindie/jMonkey-Engine,Georgeto/jmonkeyengine,atomixnmc/jmonkeyengine,delftsre/jmonkeyengine,sandervdo/jmonkeyengine,d235j/jmonkeyengine,InShadow/jmonkeyengine,GreenCubes/jmonkeyengine,rbottema/jmonkeyengine,jMonkeyEngine/jmonkeyengine,atomixnmc/jmonkeyengine,InShadow/jmonkeyengine,davidB/jmonkeyengine,d235j/jmonkeyengine,skapi1992/jmonkeyengine,tr0k/jmonkeyengine,yetanotherindie/jMonkey-Engine,tr0k/jmonkeyengine,rbottema/jmonkeyengine,davidB/jmonkeyengine,InShadow/jmonkeyengine,tr0k/jmonkeyengine,wrvangeest/jmonkeyengine,danteinforno/jmonkeyengine,danteinforno/jmonkeyengine,yetanotherindie/jMonkey-Engine,skapi1992/jmonkeyengine,danteinforno/jmonkeyengine,bertleft/jmonkeyengine