Cleaning up message API: private message are not allowed to log; application logic should not be handled inside APIs
User module in process
Merge pull request #237 from liuchuangww/user

User module in process
user join selection
user join selection
user join selection
user join selection
Add robot.txt
Merge pull request #238 from linzongshu/user

Completed setting avatar
Merge pull request #239 from voltan/develop

Add robots.txt
Merge branch 'develop' into user
Merge branch 'user' of https://github.com/pi-engine/pi into user
Changed user profile data schema
Updated sql schema for user field
User join selection
Merge pull request #240 from liuchuangww/user

User join selection
Changed table name field_display to display_field
User module in process
Chage sql display filed
Added relationship API and privacy schema