Add CentroidTuple3d op#420

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rimadoma wants to merge 5 commits intoimagej:masterfrom

bonej-org:vec-centroid

Commits on Jun 19, 2018

Add tuple3d centroid op
rimadoma
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Conform to new API
Richard Domander
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Commits on Jun 20, 2018

Switch to JOML
Richard Domander
committed
Remove unused dependency
Richard Domander
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Add missing dependency
Richard Domander
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