Removing hard coded references to Serial interface#3

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witnessmenow:Removing_Hard_Coded_Serial

Commits on Oct 1, 2017

Pulling in changes from Brandon Bluetooth Button project: https://conoroneill.net/introducing-the-bandon-bluetooth-button-bbb-using-rn42-hid/
witnessmenow
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Forgot to add examples to last commit
witnessmenow
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