WIP switching linux sysfs io to shared package
Add label property to DigitalPin
beaglebone now uses sysfs package
Add sysfs tests
Add docs
DigitalPin is now an interface
Add digital io and i2c tests
Tests for digital io and i2c
Update list of platforms/drivers
Update .travis.yml
Merge pull request #140 from hybridgroup/sysfs

linux sysfs package