- Changed `STORY_CHANGED` to `STORY_RENDERED` in `addon-notes`
- Changed `STORY_CHANGED` to `STORY_RENDERED` in `addon-cssresources`
- Updated README for `addon-cssresources`
- Updated writing-addons docs to reflect event change:
Create `CssResource` interface and use it in `CssSourcePanel`.
Also update README because some commits ago, `name` attribute used in cssresources conf has been renamed to `id`