Added an ignore debug flag

Here's the use case for this - I have a staging server that uses django-pipeline.

I want to have debug running in the case of code errors, but I also want to test pipeline. With pipeline's turned on, the default static handling won't work so the debug_cling won't work. So to get both Django's debug turned on and pipeline working at the same time, I need a way to have cling work as normal despite django's debug status.