Make digital pin traits fallible#97

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eldruin wants to merge 17 commits into

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eldruin:fallible_pin_traits

Commits on Sep 29, 2018

Put fallible OutputPin behind use-fallible-digital-traits feature
eldruin
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Make StatefulOutputPin inherit from OutputPin to inherit its error type
eldruin
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Commits on Sep 30, 2018

Commits on Oct 12, 2018

Split implementations to leave infallible traits untouched though deprecated
eldruin
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Add use-fallible-digital-traits to travis matrix
eldruin
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Commits on Oct 16, 2018