emberjs/ember.js v2.5.1

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Changelog

• #13310 [BUGFIX] Fix mouseenter typo in ember-testing helpers.
• #13333 [BUGFIX] Prevent the toString property from being added to the objects own
  properties. Fixes scenarios where the list of own properties changed in debug builds.
• #13335 [BUGFIX] Ensure injected property assertion checks container. Fixes issues
  with usage of objects created by older addons that are attempting to use Ember.inject.service().
• #13344 [BUGFIX] Remove Ember.merge deprecation.