Added test to expose a problem reported in Issue 14. The test confirmed that there is no bug in treebeard triggering the problem.
Added test to expose a problem reported in Issue 14. The test confirmed that there is no bug in treebeard triggering the problem.

Fixes issue 14

skirsdeda/django-treebeard,django-treebeard/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,tabo/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard