Improve glitter tag tests
Improve glitter tag tests

Switch to SimpleTestCase for speed, test both ``glitter_head`` and ``glitter_startbody``

blancltd/django-glitter,blancltd/django-glitter,developersociety/django-glitter,developersociety/django-glitter,developersociety/django-glitter,blancltd/django-glitter