Mixed mode packing now 0-indexes unlabeled dense features.
Mixed mode packing now 0-indexes unlabeled dense features.

thammegowda/incubator-joshua,lukeorland/joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,lukeorland/joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,lukeorland/joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,lukeorland/joshua,lukeorland/joshua,thammegowda/incubator-joshua,lukeorland/joshua,lukeorland/joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,lukeorland/joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,lukeorland/joshua