Added protected artifact for gatk pipelines

protected/biopet-gatk-pipelines/.gitignore

protected/biopet-gatk-pipelines/pom.xml

.../sasc/biopet/pipelines/gatk/GatkBenchmarkGenotyping.scala

...a/nl/lumc/sasc/biopet/pipelines/gatk/GatkGenotyping.scala

...ala/nl/lumc/sasc/biopet/pipelines/gatk/GatkPipeline.scala

...sasc/biopet/pipelines/gatk/GatkVariantRecalibration.scala

.../lumc/sasc/biopet/pipelines/gatk/GatkVariantcalling.scala

...umc/sasc/biopet/pipelines/gatk/GatkVcfSampleCompare.scala

...umc/sasc/biopet/pipelines/gatk/SampleCompareMetrics.scala

protected/pom.xml