python-monotonic: new recipe, version 0.4

On Python 3.3 or newer, monotonic will be an alias of time.monotonic
from the standard library. On older versions, it will fall back to
an equivalent implementation.

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>