Catch up to Rails 4.0 (>= 3.2) about stylesheets and javascripts

After 3.2
- stylesheet :: app/assets/stylesheets
  - extension is .css.sass as defualt
  - but extension is .css.scss in this commit
- javascript :: app/assets/javascripts
  - extension is .js.coffee as default
Catch up to Rails 4.0 about executable directory

- scripts -> bin
Add command to find routes.rb