revise ballgwon output files

tasks/ballgown.wdl

@@ -10,6 +10,8 @@ task ballgown {
       mkdir -p /cromwell_root/tmp/${base}
       cp -r ${sep=" " ballgown} /cromwell_root/tmp/${base}
       ballgown /cromwell_root/tmp/${base} ${base}.txt
+      sed -i 's/"//g' ${base}.txt
+      sed -i '1s/FPKM./GENE_ID\t/g' ${base}.txt
     >>>
     
     runtime {