Removed duplication and update_calculation_on_fail
Fixed the tests
Removed celeryconfig.py
Switched to a ProcessPoolExecutor
Closed all connections
Closed all connections after a job has run
Closed the connections before the tasks too
Reverted to a situation with a ThreadPool
Made configurable the maximum number of concurrent jobs
Fixed the indentation of update_calculation
Merge pull request #21 from gem/remove-celery

Remove celery