Add code from gene_network.rst
Add code from gene_network.rst

sorgerlab/indra,johnbachman/belpy,sorgerlab/belpy,johnbachman/indra,sorgerlab/indra,bgyori/indra,johnbachman/belpy,johnbachman/indra,bgyori/indra,sorgerlab/indra,sorgerlab/belpy,johnbachman/indra,johnbachman/belpy,sorgerlab/belpy,bgyori/indra