Update django_facebook/admin.py

Do not crash on user without images.
Update django_facebook/static/css/facebook.css

Tweaking a CSS image URL which causes problems with django-pipeline.

There should be no side affects from this. I think the problem was
caused because the relative URL stepped outside the static root and 
then back in again.
proper testing for open facebook, added support for deletes
works?
upgraded version number
fixed testing flow
robust create test user flow
added docs
version up
caching to speed up tests
Merge pull request #231 from adamcharnock/patch-1

CSS tweak for benefit of django-pipeline.
Merge pull request #225 from danosaure/patch-1

Update django_facebook/admin.py
error mapping refactoring
further simplified error mapping code
cleanup
bump
Error mapping testing
awesome weird error detection :)
cleaner is json detection
more cleanup