fix(blueprint): remove silent-error

looks like it was added to blueprints' package.json by error, it should be a dep of
angular-cli and not a dep of the scaffolded app.

Author: IgorMinar

addon/ng2/blueprints/ng2/files/package.json

@@ -32,7 +32,6 @@
     "karma-chrome-launcher": "^0.2.1",
     "karma-jasmine": "^0.3.6",
     "protractor": "^3.0.0",
-    "silent-error": "^1.0.0",
     "ts-node": "^0.5.5",
     "tslint": "^3.3.0",
     "typescript": "^1.8.7",