Add another test for BamDataSource
Add another test for BamDataSource

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