I've also made it so that it falls back if we accidentally forget to add a shebang to a study as this would be a breaking change.
With the fallback feature, it should work with unmodified bpmn documents.
* The Task.title returned to the front end will now attempt to process the "display_name" property for dot-notation syntax, making it possible to use this for multi-instance tasks,
but will work in all cases where we want he title to change based on values in the data model.
* Fixing a bug the test_study_api where it wasn't updated when we made recent changes to the different states of a study.
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