Part six#11

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oleksiipet wants to merge 15 commits intohyperskill:masterfrom

oleksiipet:part-six-new

Commits on Nov 24, 2018

First phase implementation done
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Commits on Nov 26, 2018

Second phase implementation done
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Commits on Dec 2, 2018

Second phase implementation done
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Commits on Dec 8, 2018

Third phase implementation done
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Commits on Dec 9, 2018

Commits on Dec 10, 2018

Fifth phase implementation done
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Commits on Dec 18, 2018

fourth phase implementation done
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Commits on Dec 27, 2018

fifth phase implementation done
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Commits on Dec 29, 2018

Commits on Jan 3, 2019

fourth phase implementation done code review
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Commits on Jan 10, 2019

final phase implementation done
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Commits on Jan 26, 2019

final phase implementation done fix code review comments
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