HT1632
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Make library compatible with the latest avr-gcc compiler.
Fixes #7.
This is because of changes to the lateset avr-gcc compiler embedded in Arduino 1.6+. Read more here.
This was split out from @jraymakers work in #6 to isolate the change.
@tdicola @PaintYourDragon @ladyada can anyone review and merge this? Thank you :smile:
Confirmed that this PR fixes the compiler error on Arduino 1.6.7