Description:

Generates BPMN classes for a BPMN XML in the current Rails app. They will be under app/bpmn. It will first validate the
bpmn xml to make sure the class names are all populated as expected.

Example:

rails generate camunda:bpmn_classes bpmn_file

This will create:
    app/bpmn/#{process_key}/class1
    app/bpmn/#{process_key}/class2