Update for product support and minor fixes#4

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loraxipam wants to merge 6 commits intopololu:masterfrom loraxipam:master

+306-46

Commits on May 13, 2019

Additions for 3.1
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Commits on May 14, 2019

Commit for 3.1.0
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Removed diff
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Fixed opcHelper return type
loraxipam
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Merge branch '3.1.0'
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Wrong version year.
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