add new signal hal_glib.py

добавлены новые сигналы для пинов 
class GPin(gobject.GObject, hal.Pin):
    __gtype_name__ = 'GPin'
    __gsignals__ = {'value-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ()),
                    'raise': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ()),
                    'fall': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ())}