Update `require.js` and `r.js` to `2.1.15`, and `almond.js` to `0.3.0`
Add an optional `options` parameter to `RequirejsHelper#javascript_path`
Add the `Requirejs::ViewProxy` class as a fallback for when `RequirejsHelper` is mixed into something that doesn't provide the full functionality of Rails views
Make minor cosmetic changes
Only overwrite baseUrl in requirejs_helper is not defined