add minimum node size
add minimum node size

cxhernandez/msmexplorer-d3,msmexplorer/msmexplorer-d3,msmexplorer/msmexplorer-d3,cxhernandez/msmexplorer-d3,cxhernandez/msmexplorer-d3,msmexplorer/msmexplorer-d3