1. update enum of EPS name
2. move development only gem to development group
1. retail_price 單位變更為萬元
2. add index to retail_price
automatically calulate airbag_number
1. 自動計算氣囊數
2. 顯示各位置氣囊
1. 拉寬#side-nav (model list)
2. set th width