Plantpredict

Further backwards compatibility with the entire SDK package. Removed all references to json.loads to support older python versions.

The authentication process should now be more compatible with older versions of python.

Fixed base authentication URL.

Added support for new authentication process and updated corresponding documentation.

- Updated list of authors
- Corrected source files for ReadTheDocs

- Fixed an issue with a broken link to the Swagger API documentation
- Updated example code to include a project location with a valid country code.