Update ESLint to v2.11.1 (latest stable) (#20068)

Fixes #19908

[skip sauce]
[skip validator]

grunt/npm-shrinkwrap.json

@@ -916,9 +916,9 @@
       "resolved": "https://registry.npmjs.org/escope/-/escope-3.6.0.tgz"
     },
     "eslint": {
-      "version": "2.10.2",
-      "from": "eslint@2.10.2",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-2.10.2.tgz",
+      "version": "2.11.1",
+      "from": "eslint@2.11.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-2.11.1.tgz",
       "dependencies": {
         "argparse": {
           "version": "1.0.7",

js/.eslintrc.json

@@ -45,6 +45,7 @@
         "no-unexpected-multiline": "error",
         "no-unreachable": "error",
         "no-useless-escape": "error",
+        "no-useless-rename": "error",
         "use-isnan": "error",
         "valid-jsdoc": "off",
         "valid-typeof": "error",
@@ -102,6 +103,7 @@
         "no-warning-comments": "off",
         "no-with": "error",
         "radix": "error",
+        "unicode-bom": ["error", "never"],
         "vars-on-top": "off",
         "wrap-iife": "error",
         "yoda": "error",

package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "autoprefixer": "^6.0.3",
     "babel-eslint": "^6.0.4",
-    "eslint": "^2.10.2",
+    "eslint": "^2.11.1",
     "grunt": "^0.4.5",
     "grunt-babel": "^5.0.3",
     "grunt-build-control": "^0.6.0",