* Ensure we dont raise exception if e.cause does not contain a message
* Ensure we handle case where e.path may be empty
* Refactor existing tests to conform to new format
- this allows us to send a notification to a provider by means of an API call
- This is in addition to the celery code.
- idea is that we can use this method to help speed up throughput by generating API traffic by node/lambda etc to supplement the celery code in times of high load.
- Driven by the fact we won't know the type in the API call
- hence we need to load notification earlier , so pass it not the id through to the send task to avoid loading it twice.
- Aim to move the code that contacts providers into it's own module.
- Celery tasks now call this module to send to provider
- No exceptions caught in the new module. Celery tasks now use any exception to trigger a retry.
- tests moved about - new test directory for the new class, all tests from celery test module moved, excepting the retry logic.
