Fix deprecations

[jenweber]

Here are a few:

• ember data - PR is herehttps://github.com/Fix ember data deprecations #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.<computed> (http://localhost:7357/assets/vendor.js:38675:9)
                    at raiseOnDeprecation (http://localhost:7357/assets/vendor.js:38605:9)
                    at HANDLERS.<computed> (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)