Travis: must use pip for matplotlib, pygraphviz in container mode
Travis: must use pip for matplotlib, pygraphviz in container mode

alubbock/pysb,jmuhlich/pysb,pysb/pysb,LoLab-VU/pysb,LoLab-VU/pysb,johnbachman/pysb,johnbachman/pysb