added support for figures in true_false and multiple choice questions
Update models.py
added pillow to the requirements.txt file for image uploads
Merge branch 'master' of https://github.com/certifiedloud/django_quiz
white space change
added sub_categories to questions
Merge pull request #1 from certifiedloud/master

merging master and dev branches
Merge pull request #10 from certifiedloud/dev

Added support for Sub-Categories