Change gene_id lookup to dict based
Change gene_id lookup to dict based

The iteration-based lookups from the hgnc_names dict were killing
performance on the evaluation set, especially in python 2 (due to the
dict.items() call).

johnbachman/indra,sorgerlab/indra,jmuhlich/indra,jmuhlich/indra,pvtodorov/indra,johnbachman/indra,sorgerlab/belpy,johnbachman/belpy,pvtodorov/indra,jmuhlich/indra,sorgerlab/belpy,pvtodorov/indra,sorgerlab/indra,bgyori/indra,johnbachman/indra,pvtodorov/indra,bgyori/indra,sorgerlab/belpy,johnbachman/belpy,sorgerlab/indra,johnbachman/belpy,bgyori/indra