Fixes deepdive-load to pass multiple sources down to driver
Fixes deepdive-load to pass multiple sources down to driver

to easily support parallel loads later.

HazyResearch/deepdive,shahin/deepdive,shahin/deepdive,HazyResearch/deepdive,sky-xu/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,sky-xu/deepdive