Removes ember-release in favor of np for releases

Author: patrickberkeley

config/release.js

@@ -42,7 +42,6 @@
     "ember-cli-htmlbars-inline-precompile": "^0.4.0",
     "ember-cli-inject-live-reload": "^1.4.1",
     "ember-cli-qunit": "^4.0.0",
-    "ember-cli-release": "1.0.0-beta.2",
     "ember-cli-shims": "^1.1.0",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-test-loader": "^1.1.0",