Added functionnality to choose between Wire and Wire1#16

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Pigeo wants to merge 9 commits intojohnrickman:masterfrom Pigeo:master

+363-214

Commits on Feb 20, 2017

added to the function init() an optional argument "i2c_bus" that gives the opportunity to use Wire1 instead of Wire on the Arduino models that have two I2C buses (such as the Arduino DUE)
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FIX: in example CustomChars, renamed variable "clock" into "_clock" to avoid a name conflict when compiling on some architectures such as Arduino DUE
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Commits on Feb 21, 2017

All members are now "protected" instead of "private" (allows class inheritance)
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Commits on Aug 19, 2017

Added "#pragma GCC diagnostic" around unsupported API functions (to avoid compiler warnings)
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