Enforce singleton deletion denial at model level. See issue #404.
Enforce singleton deletion denial at model level. See issue #404.

matthiask/feincms2-content,mjl/feincms,matthiask/django-content-editor,michaelkuty/feincms,michaelkuty/feincms,matthiask/feincms2-content,michaelkuty/feincms,nickburlett/feincms,feincms/feincms,matthiask/django-content-editor,feincms/feincms,mjl/feincms,feincms/feincms,michaelkuty/feincms,nickburlett/feincms,joshuajonah/feincms,joshuajonah/feincms,matthiask/feincms2-content,joshuajonah/feincms,joshuajonah/feincms,nickburlett/feincms,mjl/feincms,nickburlett/feincms,matthiask/django-content-editor,matthiask/django-content-editor