Add note about changing rootURL when using a custom path
Add note about changing rootURL when using a custom path

I'm new to ember-cli-rails, and this is the first issue I ran into (see #503)
koryteg/glimmer-rails,rwz/ember-cli-rails,thoughtbot/ember-cli-rails,weggesser/ember-cli-rails,seanpdoyle/ember-cli-rails,koryteg/glimmer-rails,rwz/ember-cli-rails,rwz/ember-cli-rails,seanpdoyle/ember-cli-rails,weggesser/ember-cli-rails,thoughtbot/ember-cli-rails,koryteg/glimmer-rails,weggesser/ember-cli-rails,seanpdoyle/ember-cli-rails,thoughtbot/ember-cli-rails