prevent throw array access error when `orderByChild('nested/key')`#135

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llstarscreamll wants to merge 2 commits intokreait:masterfrom llstarscreamll:master

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Commits on Nov 24, 2017

prevent throw nested array error on orderByChild('foo/bar')
llstarscreamll
committed

Commits on Dec 3, 2017

cleaning up and rename helper method
llstarscreamll
committed