use RSVP over ember-cli/lib/ext/promise#39

achambers merged 1 commit intoember-cli-deploy:masterember-cli-deploy/ember-cli-deploy-build:masterfrom

chrisgame:fix-ember-cli-deprication-warningchrisgame/ember-cli-deploy-build:fix-ember-cli-deprication-warningCopy head branch name to clipboard