Merge branch 'cnlohr:master' into v203

examples/GPIO/GPIO.c

examples/GPIO/Makefile

examples/GPIO/README.md

examples/GPIO/wiring.c

examples/GPIO/wiring.h

examples/GPIO_analogRead/GPIO_analogRead.c

examples/GPIO_analogRead/README.md

examples/GPIO_analogRead/wiring.c

examples/GPIO_analogRead/wiring.h

examples/blink/blink.bin

examples/bootload/Makefile

examples/bootload/bootload.c

examples/cpp_virtual_methods/Makefile

examples/cpp_virtual_methods/README.md

examples/cpp_virtual_methods/cpp_virtual_methods.cpp

examples/cpp_virtual_methods/example.cpp

examples/cpp_virtual_methods/example.h

examples/i2c_oled/bomb.h

examples/i2c_oled/i2c_oled.c

examples/i2c_oled/ssd1306.h