Evc

Fixes
- fix encoding of "params" argument for requests.get() method
- Add 'version' argument to kwargs_allowed list in get() function

Misc
- Update README.rst

Fixes
- Add support for 'max_results' and 'page' parameters in Evc.get() method

Fixes
- Add calling delete() method in Evc.upsert() in case of empty parameter "data"

Features
- Add Evc.upsert() method

- Refactoring

- Initial Release