Add ember-cli-release for release workflow

Author: lukemelia

package.json

@@ -21,6 +21,7 @@
     "chai": "^3.5.0",
     "chai-as-promised": "^5.3.0",
     "ember-cli": "2.7.0",
+    "ember-cli-release": "1.0.0-beta.2",
     "github": "^2.5.1",
     "glob": "^7.0.5",
     "mocha": "^3.0.2",