lib: adds the subarray method to the Sequence class

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/mpd: intro of the MPD client module

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/gpio: intro of a basic GPIO abstraction library

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/bcm2835: intro of the bcm2835 module to do GPIO on a Raspberry Pi

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
examples: adds example for the Raspberry Pi

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
contrib/mpd&rpi: intro of a physical interface for MPD on Raspberry Pi

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
Merge remote-tracking branch 'alexis/raspberry-pi'
nitdoc: disable an `assert` broken by recent merges

Possibly commit eb136d42d4850b491f65db9ac4b98591a21d7baf is the one
that broke the assert.

Signed-off-by: Jean Privat <jean@pryen.org>