Replace bound_to conditions in pysb_assembler
Replace bound_to conditions in pysb_assembler

All tests in test_pysb_assembler pass!

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