Fixed typo for root comment list
Merge pull request #375 from liuchuangww/user

Fix overwrite
Merge branch 'user' of https://github.com/pi-engine/pi into user
Added support for template an widget in activity
Renamed service Render to RenderCache
Added View service
Maintenance page in user module
Merge pull request #376 from sexnothing/user

Maintenance page in user module
Fix maintenance