Deprecation Guide for Legacy Imports

Deprecates importing from ember-data/* instead of @ember-data/* in order to prepare for the eventual removal of the legacy ember-data/*

All imports from ember-data/* should be updated to @ember-data/* except for ember-data/store. When you are using ember-data (as opposed to installing the individual packages) you should import from ember-data/store instead of @ember-data/store in order to receive the appropriate configuration of defaults.