support added for ESP32 and Teensy 3.1/3.2#76

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mrwastl wants to merge 6 commits intorepaper:masterfrom

Commits on Aug 19, 2016

changes to make it work with Teensy 3.x
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Commits on Sep 20, 2016

Merge remote-tracking branch 'upstream/master'
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Commits on Aug 13, 2017

Merge remote-tracking branch 'upstream/master'
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added support for ESP32, improved support for Teensy 3.1/3.2, added some documentation
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Commits on Aug 15, 2017

Merge remote-tracking branch 'upstream/master'
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Commits on Aug 27, 2017

S5813A: Added optional parameter for fine tuning maximum ADC voltage
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