add Optional.stream()#18

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hoeggi wants to merge 3 commits intokonmik:masterfrom

hoeggi:master

Commits on Dec 16, 2016

add Optional.stream()
Daniel Hoeggerl
committed

Commits on Dec 19, 2016

update Optional#stream to only use Stream#of
Daniel Hoeggerl
committed
add tests for Optional#stream
Daniel Hoeggerl
committed