Tested the app with Django==1.7 and only change was to add an `exlude` to the meta of an admin form.

The extent of the test was:
* a fresh install in a virtualenv with Django==1.7 and an SQLite DB
* all the tests passed
* made a couple of quiz models with different configurations, filled them with different question types, completed them and marked the essay questions
updated readme to reflect
Merge branch 'master' of github.com:tomwalker/django_quiz

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