add compatibility for ESP32 + arduino 1.8 for uno and teensy3.1/3.2#56

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lumostor wants to merge 7 commits intobillroy:masterfrom lumostor:master

+187-23

Commits on Nov 28, 2017

Commits on Nov 29, 2017

some clean up and fix EEPROM.begin
lumostor
committed

Commits on Nov 30, 2017

Commits on Dec 11, 2017

files renamed from .c to .cpp, so it can compile for arduino uno and teensy 3.2, because of HardwareSerial.h
lumostor
committed