Correct README

* Remove mentions of Sprockets integration.
* Mentions the CSRF initializer

README.md

@@ -5,41 +5,13 @@ EmberCLI applications the Rails applications serve.
 
 This addon is responsible for:
 
-- preprending Sprockets-ready paths to asset URLs. Read the [configuration]
-  section to learn how to hook into the Asset Pipeline's `asset_host`.
+- [exposing an initializer][initializer] for sending Rails' CSRF tokens
 - setting expected build variables without the user having to manipulate their
   EmberCLI app's `ember-cli-build.js`
 - creating lockfiles that `ember-cli-rails` tracks to ensure that requests halt
   until EmberCLI has had a chance to fully build
 - writing build errors to a file so that `ember-cli-rails` can display them
   as Rails errors.
 
-[configuration]: #configuration
+[initializer]: app/initializers/ember-cli-rails-addon-csrf.js
 [ember-cli-rails]: https://github.com/thoughtbot/ember-cli-rails
-[SRI]: https://github.com/jonathanKingston/ember-cli-sri#what-is-it
-
-## Configuration
-
-* `prepend` - This value will be used to generate the proper URL for
-  EmberCLI-generated assets. For an app named `frontend`, with `prepend` set
-  to `https://example.com`, the resulting URLs will be prepended with
-  `https://example.com/assets/frontend`:
-* `prefix` - This value corresponds to Rails' [`config.assets.prefix`][prefix].
-  To match Rails, it defaults to `assets`.
-
-[prefix]: http://guides.rubyonrails.org/asset_pipeline.html#precompiling-assets
-
-```js
-// ember-cli-build.js
-
-module.exports = function(defaults) {
-  var app = new EmberApp(defaults, {
-    'ember-cli-rails': {
-      prepend: 'https://example.com',
-      prefix: EmberApp.env() + '/assets',
-    }
-  });
-
-  // ...
-};
-```