bring configurable_dev up to date with changes in dev branch

- Copied over I2C bug fixes from dev branch.
- Removed make files from examples.
- Added intel galileo to Boards.h (only basic tests performed so far)
- Update library properties to new format (for Arduino 1.5.6)
- release.sh generates a build that works in Arduino 1.0.x and Arduino 1.5.6