Fix overzealous filename safety check.
Fix overzealous filename safety check.

agushuley/gu-django-tinymce,affan2/django-tinymce,lutoma/django-tinymce,leture/django-tinymce,themotleyfool/django-tinymce,aljosa/django-tinymce,aljosa/django-tinymce,leture/django-tinymce,dani0805/django-tinymce4,dani0805/django-tinymce4,Felix-neko/django-tinymce,sandow-digital/django-tinymce,joelburton/django-tinymce,agushuley/gu-django-tinymce,themotleyfool/django-tinymce,joelburton/django-tinymce,dani0805/django-tinymce4,lutoma/django-tinymce,agushuley/gu-django-tinymce,joelburton/django-tinymce,affan2/django-tinymce,kcsry/django-tinymce,themotleyfool/django-tinymce,Felix-neko/django-tinymce,lutoma/django-tinymce,kcsry/django-tinymce,Natim/django-tinymce,aljosa/django-tinymce,dani0805/django-tinymce4,Felix-neko/django-tinymce,sandow-digital/django-tinymce,leture/django-tinymce,joelburton/django-tinymce,sandow-digital/django-tinymce,affan2/django-tinymce,leture/django-tinymce,affan2/django-tinymce,kcsry/django-tinymce,agushuley/gu-django-tinymce,Felix-neko/django-tinymce,themotleyfool/django-tinymce,sandow-digital/django-tinymce,Natim/django-tinymce,lutoma/django-tinymce,aljosa/django-tinymce