Feature/add open faas use case tutorial#4

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MiniPlayer wants to merge 8 commits intodevelopfrom

feature/Add-openFaas-use-case-tutorial

Commits on Sep 30, 2019

Commits on Oct 1, 2019

Removed obsolete comments in guides.
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Commits on Oct 2, 2019

Added open-faas guide
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Commits on Oct 3, 2019

Finalized openfaas guide by adding setup of uppercase function in openfaas.
MiniPlayer
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Commits on Oct 7, 2019

Added information in openfaas tutorial
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Commits on Oct 8, 2019

Updated openfaas tutorial
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