Pylti

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- Session variables no longer trump new authentication (83)
- Update oauthlib to 2.0.6 (79)

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- Add setup.cfg to allow universal wheel building (py2 + py3)
- Changed the version variable in __init__

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- Changed Travis configuration to test also python 3
- Python 3 compatibility (keeping Python 2 compat)
- Other fix to readme
- Fixed Readme
- document correct exception thrown by flask _check_role()
- fix typos in flask post_grade docs