Dce-lti-py

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Include oauth_body_hash parameter in outcome request

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

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setup.py needs to use find_packages to find contrib stuff

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Project officially forked and renamed from [ims_lti_py](https://github.com/tophatmonocle/ims_lti_py) at v0.6. README update and HISTORY added.

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Updating project to utilize the oauthlib python library.

* convert from python-oauth2 to oauthlib & requests-oauthlib
* refactored out use of mixin classes
* LaunchParams as first class object
* Major rewrite and rename of test suite
* Use of semver version identifier
* Use of pytest and tox for test running