This commit removes the bpmn model specific parts that have been outsourced to the project bpmn-io/bpmn-moddle. In addition it removes BPMN 2.0 diagrams that were crafted especially for tests of that functionality. Closes #25
Related to #1
This commit updates the example to accompain a renderer AND modeler component.
We are able to import shapes based on BPMNDI. Related to #1