added test for Event, and fixed to pass tests
fixed various little bugs, modularized parent timeseries graphs using new Event class
modularized selected node graph
draw_colored_graph now works using events
modularized text span updates using event listeners, added triggers to application init
moved get_selected_node_form into modelBuilder class
moved get_selected_node_functional_form into modelBuilder class
modeling controls modularized using events
unified spec widget controls
improved spec control behavior. fixes options unchanged on source->state node change bug
fixed get_node_type bug
removed global getInputsOf() and used model_builder._graph.getParentsOf instead
modularized debug texts widget using events
ModelBuilder now exports class definition, not instance. instance is created in globals.
added sample graph in place of error message
added probability density function and selection graph for personality vars
added generation of personality var choices