Fixes to allow things to work in production mode

[catmando]

1. Do not add these lines to application.rb:

   config.eager_load_paths += %W(#{config.root}/app/views/components)
config.autoload_paths += %W(#{config.root}/app/views/components)

They are not longer necessary (since public models are moved), and they break production.

2. The require_tree in models.rb can only execute in Opal land:

# app/models/models.rb
require_tree './public' if RUBY_ENGINE == 'opal' # add the guard

[sfcgeorge]

These files have all moved so this issue should probably be closed.