add needsGradingCount to CKICourse
add needsGradingCount to CKICourse

the property was there, but the mapping wasn't hooked
up so you were never getting any values

nlambson/CanvasKit,derrh/CanvasKit,derrh/CanvasKit,instructure/CanvasKit,instructure/CanvasKit,derrh/CanvasKit,nlambson/CanvasKit,nlambson/CanvasKit,derrh/CanvasKit,instructure/CanvasKit,instructure/CanvasKit,nlambson/CanvasKit