Django-lti-provider

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* Change how incoming requests are assessed/verified

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* Add django 2.0 support

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* Add success / failure messaging around grade passback

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* Fixed an encoding error on LTI init in Python 3

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* Python 3 fix: items() instead of iteritems()
* Make LTIRoutingView exempt from CSRF checks

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* Session awareness
* Refactoring auth failure and course configuration paths
* Add multiple assignment routing
* Documentation
* pypi release