Remove form_state hack
controllers are now handlers.
Fixing form_state and other test fails, some cleanup
Merge remote-tracking branch 'drupal.org/8.x-1.x' into introducing-multigraph

Conflicts:
	src/Sensor/SensorManager.php
Cleanup, addressing review #20
Created MultigraphInterface, redefined getSensors()
Reasonable schema
Added calculateDependencies() to Multigraph, also unit test