Merge pull request #27 from nromanen/master

Merge
26-12 evening
111
Merge branch 'krivorotenko' of https://github.com/nromanen/ch018 into krivorotenko
before merge 29.12
Merge pull request #29 from nromanen/yurembo

Yurembo
Merge pull request #30 from nromanen/krivorotenko

Krivorotenko
Merge pull request #31 from nromanen/master

Merge