Lti

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* Add some launch params specific to the Canvas editor.
* Add contributor section to README.

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* Use ``find_packages`` in ``setup.py`` to find contrib packages.

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* Fork from _ims_lti_py_, and rename to ``dce_lti_py`` at version 0.6.
* Update README and add HISTORY.

.. _ims_lti_py: https://github.com/tophatmonocle/ims_lti_py

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* Update project to utilize oauthlib.

* Convert from python-oauth2 to oauthlib and requests-oauthlib.
* Refactor out the use of mixin classes.
* Make ``LaunchParams`` a first-class object.
* Major rewrite and rename of the test suite.
* Use SemVer version identifier.
* Use pytest and tox for test running.