Ovh

- [enhancement] add NotGrantedCall, NotCredential, Forbidden, InvalidCredential exceptions

- [fix] Python 3 tests false negative
- [fix] More flexible requests dependency

- [fix] Python 3 build

- [enhancement] support '_' prefixed keyword argument alias when colliding with Python reserved keywords
- [enhancement] add API documentation
- [enhancement] Use requests Session objects (thanks xtrochu-edp)

- [enhancement] add kimsufi API Europe/North-America
- [enhancement] add soyoustart API Europe/North-America
- [Q/A] add minimal integration test

- [enhancement] add links to 'CreateToken' pages in Readme
- [compatibility] add support for Python 2.6, 3.2 and 3.3