Bug fix + redesign for C

This release corrects a bug in big-endian output from the 4:2:0 subsample case.
It also reworks the library code to compile as either C++ or C. This allows for easier porting to other embedded environments that may not support C++ or just for personal preference. A demo program for Linux was added which includes file system support. This allows you to use it without having to write any file system callbacks.

New example and license changed to Apache 2.0

Added an example sketch by Joey Castillo to output an image to a 4-gray level e-ink display (his open-book project)
Changed the license model to Apache 2.0 for easier inclusion in other projects.

An optimized JPEG library for Arduino

I've shared this code with a few people who have contributed useful suggestions that I've implemented. I think it's ready to be called 1.0. I was toying with the idea of adding "auto-rotate" code, but it will add a lot of bulk to the project that most people will not need. The Exif orientation is available through the API if you would like to re-orient the image at the output stage.