chore(package): update ember-cli to version 2.4.2
chore(package): update ember-cli to version 2.4.2

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jrjohnson/frontend,gboushey/frontend,gabycampagna/frontend,ilios/frontend,djvoa12/frontend,dartajax/frontend,stopfstedt/frontend,jrjohnson/frontend,djvoa12/frontend,dartajax/frontend,gboushey/frontend,ilios/frontend,thecoolestguy/frontend,thecoolestguy/frontend,stopfstedt/frontend,gabycampagna/frontend