add reordering handlers#186

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damikdk wants to merge 6 commits intoaksonov:nextfrom

damikdk:add-reordering-handlers

Commits on Sep 10, 2018

Commits on Sep 11, 2018

fix crush with null blocks
damikdk
committed

Commits on Sep 28, 2018

Commits on Nov 7, 2018

fix demo
damikdk
committed