Add CarFilters controller
rename controller: car_filters => search
1. New feature: search cars by filtering safety equips
2. minor UI changes
show warning message if no car is found
use redirect_to instead of render to show index page when no car is found
UI fine tune
1. 搜尋功能新欄位：最高售價
2. 搜尋功能新增 回上一頁 按鈕
Refine search result
order search result by retail_price
1. Brands are shown only if a brand has at least one model
2. Remove toggle effect of brand list
Remove unused code
1. [BF] search condition of airbag number doesn't work
2. Limit search results to 60 cars
3. Show number of search results
1. [UI] swap position of displacement and submodel
2. 增加斜坡輔助系統
3. [BF] 修正輸入 admin 網址導致指向錯誤search controller的問題
4. header navbar 加入網站名稱
set head title to '安心上路'
change admin path
update gemfile
1. specify ruby version
2. workaround for mina login issue
Restore ruby version
Use gem: pg
commit .ruby-verion