Create comment branch
Merge branch 'user' into comment
Comment in process
Added comment APIs
Merge pull request #246 from liuchuangww/user

User module in process
Merge branch 'comment' into user
Added in-line doc for comment API
Substitute mkdir with system file service method
Updated paginator generation
Allowed non-activated users to be enabled/disabled; add NULL to result status for no-action
Code cleaning up for comment spec
Fixed typo for user installer
Added comment installer resource
Refactor params code style