lib/mnit: fix doc of MotionEvent (fix #182)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/signals: move signals getter to Object

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/signals: intro Process::kill and Process::signal (fix #180)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: add test for Process::signal and Process::kill

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/signals: improve doc and add nitunits (fix #175)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/posix: add doc to posix (fix #174)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/signals: use `do end` in empty methods of signals

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>