Merge branch '32_multiprocessing_support_for_cacheddatasource' into 'master'

beat/backend/python/data.py

beat/backend/python/data_loaders.py

...hon/test/prefix/algorithms/autonomous/multiprocess/1.json

...ython/test/prefix/algorithms/autonomous/multiprocess/1.py

...thon/test/prefix/algorithms/autonomous/multiprocess/1.rst

...hon/test/prefix/algorithms/sequential/multiprocess/1.json

...ython/test/prefix/algorithms/sequential/multiprocess/1.py

...thon/test/prefix/algorithms/sequential/multiprocess/1.rst

beat/backend/python/test/test_algorithm.py

beat/backend/python/test/test_data.py

beat/backend/python/test/test_data_loaders.py