added `custom_canvas_course_sectionsissourceids`, `custom_canvas_person_email_sis` and `custom_canvas_term_name` to the list of fields captured from the LTI launch

Python 3 and Django 2 Updates

Replace OrderedDict in multi-launch middleware

Replace OrderedDict in multi-launch middleware.

Supports Django 1.10+

Fix type error when transitioning old tools to use patched middleware

Hotfix/patch reverse import

For some reason, in a Gunicorn deployment the `shortcuts` module isn’t available from the `django.shortcuts.reverse` line, after importing django.  trying  a different way of importing to get this to work.

Feature/django1 10 monkeypatching fix

Update monkey-patching of reverse method to account for Django 1.10 moving that method into the django.urls package.

Merge pull request #36 from Harvard-University-iCommons/bugfix/rascalking/tlt-2211/bump-version-in-setup-py

Sprint 45 TLT-2211 Oops, bump the version in setup.py

Merge pull request #35 from Harvard-University-iCommons/bugfix/rascalking/tlt-2211/cleanly-catch-and-log-oauth-error

Sprint 45 TLT-2211 Catch, log, and handle lti oauth validation errors better

in this case, better means explicitly catching oauth errors (since
ims_lti_py doesn't catch-and-wrap them).  now we can log the error
alongside the post params, to help us troubleshoot from the prod logs,
and we can return a permission denied error, so the user gets an
unauthorized page instead of a 500 internal sever error.

Merge v1.2.4 to master