Add process_picture_done signal
#231
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This PR implements a new signal,
process_picture_done, which is emitted when the task completes. It adds a new kwarg toPictureProcessorinstances,field, which is a string so that it can be serialized in Celery and contains the model name, app label and field name. This, combined with the file name, allows the user to find which instance(s) this processing task corresponds to, so that they could then take action, e.g. by setting a processing done field in the database.Any feedback welcome!
See #160