add name field to users
rename welcome controller
Revert "rename welcome controller"

This reverts commit 2de193e6f097272ad127d0b817afe9aecc5b13e9.
only admin can visit rails_admin
contribution page can show brands and models
1. add models page
2. refine description
1. contribution 顯示車款列表
2. authenticate user on edit page
add contributions/cars controller
show car data table on contribution page
redesign car list of contribution
refine wordings
finish part of car form
完成車款資料編輯表格
minor form refine
編輯後台可公開/隱藏車款
better file location
1. user can create new car
2. refine wordings
1. 建立新車款時預先載入同車系最近一台被編輯過的車款資料
2. 編輯或建立車款完成後，顯示提醒訊息
3. 資料有錯時顯示提醒訊息
4. refine wordings
使用者可新增車系
1. rename search/search to search/results
2. 可搜尋駕駛疲勞警示系統