Package as standard library & publish to Library Manager

[beriberikix]

It would be a lot easier to install via the Library Manager. See spec here & publishing instructions.

[ed7coyne]

When we do this we should set which header files to include: https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#15-library-format-rev-21

And not include the ones for the modem/things that share this repo.