Optimized nested collections deletion in DocumentPersister#1879

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watari wants to merge 2 commits intodoctrine:1.2.xfrom watari:1.2.x

+129-2

Commits on Oct 19, 2018

Implemented CollectionPersister::deleteAll method for simultaneous deletion of collections that is belong to one document.
watari
committed

Commits on Oct 22, 2018

Added check for sub-paths before collections removal in CollectionPersister::deleteAll. Fixed style of code.
watari
committed