Mention `ember g photoswipe` for clean installs
Mention `ember g photoswipe` for clean installs

Ideally `ember g photoswipe` shouldn't be required after each clean bower install,
but for now a warning does the job for the current functionality.
n3k/ember-cli-photoswipe,igorrKurr/ember-cli-photoswipe,StreetHub/ember-cli-photoswipe,osxi/ember-cli-photoswipe,n3k/ember-cli-photoswipe,StreetHub/ember-cli-photoswipe,poetic/ember-cli-photoswipe,AltSchool/ember-cli-photoswipe,igorrKurr/ember-cli-photoswipe,ssendev/ember-cli-photoswipe,AltSchool/ember-cli-photoswipe,ssendev/ember-cli-photoswipe,poetic/ember-cli-photoswipe,osxi/ember-cli-photoswipe