auto add content items.

[atkinson]

How to use:

Change the setting:

FIBER_AUTO_CREATE_CONTENT_ITEMS = True

Then for every show_content tag in your template:

{% show_content "some-slug" %}.

... fiber will auto create a placeholder ContentItem object.

[nvandijk]

Hi Atkinson,
Thanks for your pull request. I have manually merge your commit in the dev branch (9cfe26c). I removed the extra function call:

return show_content(context, content_item_name)

This caused an extra sql query when the ContentItem was created