Update the pin mappins in Sd2PinMap.h for the Papilio Duo, and add ma…#5

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bwalderman wants to merge 1 commit intoGadgetFactory:masterfrom bwalderman:master

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Commits on Sep 10, 2017

Update the pin mappins in Sd2PinMap.h for the Papilio Duo, and add macros to enable software SPI on the AVR when connected to a Classic Computing Shield.
bwalderman
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