Vka

Исправление авторизации в связи с переходом VK на новый дизайн

- Add raw parameter to VkApi.method (e.g. to get 'execute_errors')
- Make VkUpload.audio artist and title optional
- VkRequestsPool: fix getting lists; ability to get errors;
- Update security check URL (less redirects)

- Default API version: 5.52
- Add VkUpload.audio
- Implement availability Captcha image directly from object
- Implement device remembering for two-factor authentication
- VkRequestsPool: fix unicode in request values; fix errors handle
- jconfig: dict-like
- Fix requests session hearders update
- Thread-safety for delaying requests

Thanks for AlexTalker and kuraga