chore(package): update ember-ajax to version 2.4.0
chore(package): update ember-ajax to version 2.4.0

https://greenkeeper.io/
mike-north/ember-material-lite,mike-north/ember-material-lite,truenorth/ember-material-lite,truenorth/ember-material-lite,truenorth/ember-material-lite,mike-north/ember-material-lite