using arel table rather than sql quoted table
Merge branch 'master' of https://github.com/rails/rails into my_arel
Merge branch 'master' of https://github.com/rails/rails into my_arel
Merge branch 'master' of https://github.com/rails/rails into my_arel
Merge branch 'master' of https://github.com/rails/rails into my_arel
Merge branch 'master' of https://github.com/rails/rails into my_arel
Merge branch 'master' of https://github.com/rails/rails into my_arel
using stron parameters in guides [ci skip]