remove unused require from Root
remove unused require from Root

snaheth/pileup.js,piotr-gawron/pileup.js,snaheth/pileup.js,hammerlab/pileup.js,snaheth/pileup.js,piotr-gawron/pileup.js,piotr-gawron/pileup.js,hammerlab/pileup.js,hammerlab/pileup.js,piotr-gawron/pileup.js,snaheth/pileup.js,hammerlab/pileup.js