Add internal cache manager (#13) #119

Job	Run time
base-tests (3.8, TEST=test_Config)	1m 45s
base-tests (3.8, TEST=test_Dataset)	1m 46s
base-tests (3.8, TEST=test_GeneratingDataset)	6h 0m 4s
base-tests (3.8, TEST=test_hdf_dump)	1m 48s
base-tests (3.8, TEST=test_HDFDataset)	2m 22s
base-tests (3.8, TEST=test_LearningRateControl)	1m 51s
base-tests (3.8, TEST=test_SprintDataset)	1m 52s
base-tests (3.8, TEST=test_TranslationDataset)	1m 48s
base-tests (3.8, TEST=test_Util)	1m 45s
base-tests (3.8, TEST=pytorch/test_engine)	1m 51s
	6h 16m 52s

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