added support for getting message attributes
added support for getting message attributes

juggernate/pymel,leonsooi/pymel,shrtcww/pymel,cgrebeld/pymel,david-lassonde-adsk/pymel,david-lassonde-adsk/pymel,juggernate/pymel,shrtcww/pymel,assumptionsoup/pymel,AtonLerin/pymel,assumptionsoup/pymel,AtonLerin/pymel,leonsooi/pymel