Add `._pi_perfect-scrollbar` as library.
Use `._pi_{pluginName}`
- Add option `keepSpecialComments` to `0` on minifycss.
- Rename the vendor name for jquery validation.
Add classes `.left_show` and `.right_hide` as default
Update and have some scrolleffect specially for mobile
Inserted `div.message`
Remove `overflow:hidden` in scaffolding.less and update hpac.less
OK. Use the power of `position` with `left` and `right`. LOL