Part three#7

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oleksiipet wants to merge 5 commits intohyperskill:masterfrom

oleksiipet:part-three

Commits on Nov 24, 2018

First phase implementation done
opetenko
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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
opetenko
committed

Commits on Dec 8, 2018

Third phase implementation done
opetenko
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Commits on Dec 16, 2018

third phase implementation done
opetenko
committed