add mptt.register() back in after use cases were reported making it neccessary sometimes, and after finding it's not actually too hard to do. 0.4.2 candidate pending resolution of comments on gh-19
add mptt.register() back in after use cases were reported making it neccessary sometimes, and after finding it's not actually too hard to do. 0.4.2 candidate pending resolution of comments on gh-19

fusionbox/django-mptt,emilhdiaz/django-mptt,emilhdiaz/django-mptt,restless/django-mptt,lojaintegrada/django-mptt,caktus/django-mptt,musashiXXX/django-mptt,shultais/django-mptt,danielnaab/django-mptt,musashiXXX/django-mptt,matthiask/django-mptt,andybak/django-mptt,watchdogpolska/django-mptt,fusionbox/django-mptt,AndrewGrossman/django-mptt,watchdogpolska/django-mptt,michaeljohnbarr/django-mptt,matthiask/django-mptt,michaeljohnbarr/django-mptt,andybak/django-mptt,emilhdiaz/django-mptt,restless/django-mptt,AndrewGrossman/django-mptt,danielnaab/django-mptt,michaeljohnbarr/django-mptt,Sinkler/django-mptt,restless/django-mptt,promil23/django-mptt,lojaintegrada/django-mptt,Sinkler/django-mptt,caktus/django-mptt,promil23/django-mptt,musashiXXX/django-mptt,lojaintegrada/django-mptt,pjdelport/django-mptt,fusionbox/django-mptt,matthiask/django-mptt,watchdogpolska/django-mptt,watchdogpolska/django-mptt,emilhdiaz/django-mptt,AndrewGrossman/django-mptt,Sinkler/django-mptt,sandow-digital/django-mptt-sandow,andybak/django-mptt,matthiask/django-mptt,caktus/django-mptt,shultais/django-mptt,denys-duchier/django-mptt-py3,sandow-digital/django-mptt-sandow,denys-duchier/django-mptt-py3,shultais/django-mptt,promil23/django-mptt,pjdelport/django-mptt