Tapatalk Forum App 移动设备应用 3.1.5

- solved error in connection classes in forums without CURL installed and php version < 5.5
- Removal of email engagement functions.
- Some changes in code to access Tapatalk servers, this will improve push and sso response time.
- checked compatibility with xenforo 1.5.x
- removed welcome screen
- improved google indexing code
- added https support for emoji
- solved issue with push notifications in new topic
- added new type of push notification when someone subscribe to your topic