Add comment concerning the purpose of _feincms_extra_context
Add comment concerning the purpose of _feincms_extra_context

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