Fix deprecations

Here are a few:

- [x] ember data - PR is herehttps://github.com/empress/guidemaker/pull/35
```
---
browser log: |
WARN: DEPRECATION: store.serializerFor("version") resolved the "-json-api" serializer via the deprecated `adapter.defaultSerializer` property.

Previously, if no application or type-specific serializer was specified, the store would attempt to lookup a serializer via the `defaultSerializer` property on the type's adapter. This behavior is deprecated in favor of explicitly defining a type-specific serializer or application serializer [deprecation id: ember-data:default-serializer] See https://deprecations.emberjs.com/ember-data/v3.x#toc_ember-data:default-serializers for more details.
at logDeprecationStackTrace (http://localhost:7357/assets/vendor.js:38578:21)
at HANDLERS. (http://localhost:7357/assets/vendor.js:38675:9)
at raiseOnDeprecation (http://localhost:7357/assets/vendor.js:38605:9)
at HANDLERS. (http://localhost:7357/assets/vendor.js:38675:9)
at invoke (http://localhost:7357/assets/vendor.js:38687:9)
at Object.deprecate (http://localhost:7357/assets/vendor.js:38643:28)
at DefaultStore.serializerFor (http://localhost:7357/assets/vendor.js:99521:37)
at http://localhost:7357/assets/vendor.js:95948:30
at invokeCallback (http://localhost:7357/assets/vendor.js:62786:17)
WARN: DEPRECATION: store.serializerFor("page") resolved the "-json-api" serializer via the deprecated `adapter.defaultSerializer` property.
```

- [ ] No implicit this
- [ ] Angle bracket components (requires a polyfill)