copy cms-before to cms-after
Install Mercury

1. Add mercury gem
2. rails g mercury:install
3. Remove require_tree . in application.js
rails g mercury:install:images

1. Refer to https://www.bountysource.com/issues/1072031-ar_paperclip_image-rb-erb-filename-problem?utm_campaign=plugin&utm_content=tracker%2F134071&utm_medium=issues&utm_source=github for fixing "Could not find "ar_paperclip_image.rb" in any of your source paths." error
2. bundle install
3. rake db:migrate