Added a git ignore

.gitignore

+/bam-metrics/dependency-reduced-pom.xml
+/biopet-framework/nbactions.xml
+/pipeline-template/dependency-reduced-pom.xml
+/pipeline-template/nbactions.xml
+/gatk-variantcalling/nbactions.xml
+/gatk-variantcalling/dependency-reduced-pom.xml
+/bam-metrics/nbactions.xml
\ No newline at end of file