SecEMS: encrypted messenger

Nov 25, 2016

1. Support high-resolution avatar
2. Add create chat group shortcut
3. Group name can be modified
4. Cancel the number of chat group creation limit
5. Add SecEMS secretary function
6. Resolved the message receipt status is not timely or lost
7. Resolved message duplication problem
8. Resolved some phone can not receive the message notification problem
9. Resolve the failure of the key update to cause the message to not decrypt the problem
10. Resolve the memory leak problem