Add metaprogramming notes(Vaksman Denis)#5

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DrDet wants to merge 9 commits intosorokin:masterfrom

Commits on Dec 27, 2017

add metaprogramming notes(Vaksman Denis)
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Commits on Dec 30, 2017

Commits on Jan 3, 2018

final version
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Commits on Jan 10, 2018

small fix
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Commits on Jan 19, 2018

one more small fix
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fix typo
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