Smaller Raspberry image size

[David-Estevez]

Since we are not using the whole Raspian (think about the graphical interface, for instance) we can decrease the size of the image for the release.

Refs:

• http://www.cnx-software.com/2012/07/31/84-mb-minimal-raspbian-armhf-image-for-raspberry-pi/
• https://github.com/andrius/build-raspbian-image
• http://www.cnx-software.com/2012/07/31/84-mb-minimal-raspbian-armhf-image-for-raspberry-pi/

[jgvictores]

Haven't seen refs, but this could be done via fsarchiver as done elsewhere.

[jgvictores]

Just to clarify:

• The dd mechanism used at time of writing creates larger images than fsarchiver which is being studied at time of writing
• The original purpose of this issue is effectively reducing the OS disk usage size, e.g. by removing GUI components, which would directly result in a smaller image via fsarchiver

[jgvictores]

Update: fsarchiver was successfully used at asrob-uc3m/rd-ambassador#1 (comment)