Refs #17 - Implemented cache and small bugfix + refactor to make this work

4 jobs for feature/17-external-source-caching in 5 minutes and 21 seconds
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  Test
passed python35 #721

00:02:35

passed python36 #722

00:02:35

passed python_coverage #723

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86.04%
passed python_pylint #724

00:00:42