1. https://developer.staging.ubuntu.com/en/snappy/start/as-dev/
2. https://developer.staging.ubuntu.com/en/snappy/start/as-dev/16-04/step2-setup-rpi2-ubuntu/
3. https://developer.staging.ubuntu.com/en/snappy/start/as-dev/16-04/step3-get-familiar/
4. https://developer.staging.ubuntu.com/en/snappy/start/as-dev/16-04/step4-first-snap/
5. https://developer.staging.ubuntu.com/en/snappy/start/as-dev/16-04/step5-further-readings/