fix typo in test
Merge pull request #4995 from crismali/fix-typo-in-test

fix typo in test
fix typo in test
Made Ember.uuid an internal function and made sure it is used wherever uuids are generated
Merge pull request #4996 from crismali/make-ember-uuid-a-method

Made Ember.uuid a method and made sure it is used wherever uuids are generated