Fix gulp build.
Fix gulp build.

benelliott/angular2-select,basvandenberg/angular2-select,basvandenberg/angular2-select,basvandenberg/ng-select,basvandenberg/ng-select,benelliott/angular2-select,benelliott/angular2-select,basvandenberg/ng-select,basvandenberg/ng-select,benelliott/angular2-select,basvandenberg/angular2-select