Removes esnext features from addon code. Tests still rely on it, so travis.yml still uses 4.4.3
Removes esnext features from addon code. Tests still rely on it, so travis.yml still uses 4.4.3

MiguelMadero/ember-cli-bundle-loader,gokatz/ember-cli-bundle-loader,gokatz/ember-cli-bundle-loader,MiguelMadero/ember-cli-bundle-loader