* string-based path declaration for topologies. * custom node border widths in plot_topology.
0.2.9
* composite.merge() uses the provided topology to override merged composite topology
0.2.8
* improved plot_topology
0.2.7
* plot_topology includes new the `graph_options`: `horizontal` and `hierarchy`, and new `process_colors` and `store_colors` for coloring individual nodes.
0.2.6
* new Composite and AggregateComposer classes in core/process.py