New MCP23017 library

I think I have ironed out all my bugs with this library and I have made it available here if anyone cares to give it a try.

Suggestions and bug fix requests welcome.

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There does not seem to be any obvious way to create a folder structure on Github so my testing/example sketch is in the same folder as the cpp and h files.

You will have to manually create the library folder structure in the arduino folder.