Merge pull request #430 from liuchuangww/user

Fix timeline api
Formulated identity APIs
Merge branch 'user' of https://github.com/pi-engine/pi into user
Completed front-end of other's comments view page
Completed front-end of all active comments page
Removed debug info
Merge pull request #431 from linzongshu/user

Completed front-end of other's comments view page
Achieved basic front-end of select user comments
Added user webservice skeleton
Modified copywriting
Merge pull request #432 from linzongshu/user

Achieved basic front-end of select user comments
Add user config params