Add support for ignoreRestSiblings in no-unused-vars (facebook#1705)

* updating eslint to 3.16.1

* add support for ignoreRestSiblings in eslint

http://eslint.org/docs/rules/no-unused-vars#ignorerestsiblings

* updating eslint to 3.16.1 in `react-scripts`

* updating eslint

* missing `^`

* missing ^

* pinning main eslint and updating readme

* Pin ESLint version

Author: chrisdrackett

package.json

@@ -37,7 +37,7 @@
     "css-loader": "0.26.1",
     "detect-port": "1.0.1",
     "dotenv": "2.0.0",
-    "eslint": "3.8.1",
+    "eslint": "3.16.1",
     "eslint-config-react-app": "^0.5.2",
     "eslint-loader": "1.6.3",
     "eslint-plugin-flowtype": "2.21.0",