Merge pull request #111 from blueduckjf/jjf_externc

Add extern C guards for AVR when using C++

Merge pull request #109 from MatejKocourek/interrupt_macro

Merge pull request #108 from MatejKocourek/attribute_fix

Make interrupt handling configurable

Added packed attribute to structs that require it

Merge pull request #106 from un-clouded/master

The comments are now a bit lighter and the conditional compilation is no more.

Now builds on avr-gcc 5.4.0.

Update README.md

Merge pull request #104 from cpldcpu/v2.6testing

Add attiny10 support back in

update README.md

Update README.md

Add support for reduced core AVR and fix location of ws2812_config.h