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

4 jobs for feature/17-external-source-caching in 5 minutes and 4 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Test
passed python35 #806

00:02:33

passed python36 #807

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passed python_coverage #808

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86.04%
passed python_pylint #809

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