use only one alignment array
use only one alignment array

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