fixing oom error on travis
fixing oom error on travis

changed to the beta trusty infrastructure on travis because it offers 7g of memory instead of 3

adding gradle jvm memory limit
adding test jvm memory limit

broadinstitute/hellbender,frank-y-liu/gatk,magicDGS/gatk,broadinstitute/hellbender,ksthesis/gatk,broadinstitute/hellbender,frank-y-liu/gatk,broadinstitute/hellbender,magicDGS/gatk,magicDGS/gatk,broadinstitute/hellbender,ksthesis/gatk,magicDGS/gatk,ksthesis/gatk,frank-y-liu/gatk,broadinstitute/hellbender,frank-y-liu/gatk,ksthesis/gatk,ksthesis/gatk,magicDGS/gatk,frank-y-liu/gatk,ksthesis/gatk,magicDGS/gatk,frank-y-liu/gatk