Merge pull request #348 from liuchuangww/user

Add build user data and fix some bug
Typo fix
Perm config in system module
Merge pull request #349 from sexnothing/user

Perm config in system module
Bugfix for application/json detection
Merge branch 'user' of https://github.com/pi-engine/pi into user
Typo fix for comment post operation
Perm config in system module
Merge pull request #350 from sexnothing/user

Perm config in system module
Refactor and fix some bug