PSN integration for Galaxy 2

Supports game list & achievements. I don't think PS has play time tracking ATM.

Credits

I've based this partially on work done by others:

• https://github.com/jhewt/gumer-psn
• https://github.com/Tustin/psn-php
• https://github.com/mgp25/psn-api
• https://github.com/adrianzhang/wechat-psn-backend