Code clean for search
Merge pull request #814 from liuchuangww/develop

Fix article content api
Merge branch 'develop' of https://github.com/pi-engine/pi into develop
Search module update
Merge pull request #815 from sexnothing/develop

Search module update
CS fix
Merge branch 'develop' of https://github.com/pi-engine/pi into develop
CS fix
Front nav update to before
Merge pull request #816 from sexnothing/develop

Front nav update to before
Search modu
Search module and defualt theme update
Merge pull request #817 from sexnothing/develop

Search module and defualt theme update
Added category navigation in list page
Merge pull request #818 from linzongshu/develop

Added category navigation in list page
Changed appkey length from 255 to 64
Changed appkey length from 255 to 64
Default theme navbar update
Front.css update
Default theme navbar fixed