* Fix topology plot to avoid using `plt.figure` so that plots work correctly when other plotting functions are used in the same Python session (e.g. Jupyter notebooks).
0.3.12
* add composite specification
0.3.11
* fix bug in serializing list
0.3.10
* add `emitter_registry`, so that emitters can be added from different repositories by importing the registry and registering their emitter. * add `_condition` key to process parameters, that lets them by conditionally triggered by connecting to a boolean states in the hierarchy.
0.3.9
* reduce mongo document limit for the DatabaseEmitter
0.3.8
* revert rename of divider argument to "state" * do not allow _add updates with repeat keys