Added support for Raspberry Pi model B.#90

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groupmsl wants to merge 3 commits intoraspberry-sharp:masterfrom

groupmsl:RPiBSupport

Commits on Jul 8, 2017

Added support for Raspberry Pi model B.
groupmsl
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Commits on Jul 10, 2017

Added General Purpose GPIO support for Raspberry Pi model B.
groupmsl
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Commits on Sep 12, 2017

MemoryGpioConnectionDriver.cs now also supports Raspberry Pi model B.
groupmsl
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