update tests for htmlSafe/isHTMLSafe Ember.String deprecation
update tests for htmlSafe/isHTMLSafe Ember.String deprecation

stefanpenner/ember.js,knownasilya/ember.js,stefanpenner/ember.js,emberjs/ember.js,stefanpenner/ember.js,tildeio/ember.js,tildeio/ember.js,sly7-7/ember.js,emberjs/ember.js,sly7-7/ember.js,knownasilya/ember.js,elwayman02/ember.js,mixonic/ember.js,tildeio/ember.js,emberjs/ember.js,mixonic/ember.js,sly7-7/ember.js,elwayman02/ember.js,knownasilya/ember.js,elwayman02/ember.js,elwayman02/ember.js,mixonic/ember.js