build: Updating npm dependencies

* grunt-eslint: 20.1.0 → 22.0.0
* eslint-config-wikimedia: 0.5.0 → 0.15.0
  The following rules are failing and were disabled:
  * brace-style
  * camelcase
  * eqeqeq
  * max-len
  * max-statements-per-line
  * new-cap
  * no-constant-condition
  * no-dupe-keys
  * no-empty
  * no-implicit-globals
  * no-mixed-spaces-and-tabs
  * no-redeclare
  * no-tabs
  * no-undef
  * no-underscore-dangle
  * no-unused-vars
  * no-use-before-define
  * no-useless-concat
  * one-var
  * valid-jsdoc
  * vars-on-top

Additional changes:
* Added .eslintcache to .gitignore.
* Removing manual reportUnusedDisableDirectives for eslint.

Change-Id: I7cf9b60dbde7168ade24d2e8847617244d6a6ae1

.eslintrc.json

@@ -7,5 +7,28 @@
 	"globals": {
 		"mw": false,
 		"$": false
+	},
+	"rules": {
+		"brace-style": "warn",
+		"camelcase": "warn",
+		"eqeqeq": "warn",
+		"max-len": "warn",
+		"max-statements-per-line": "warn",
+		"new-cap": "warn",
+		"no-constant-condition": "warn",
+		"no-dupe-keys": "warn",
+		"no-empty": "warn",
+		"no-implicit-globals": "warn",
+		"no-mixed-spaces-and-tabs": "warn",
+		"no-redeclare": "warn",
+		"no-tabs": "warn",
+		"no-undef": "warn",
+		"no-underscore-dangle": "warn",
+		"no-unused-vars": "warn",
+		"no-use-before-define": "warn",
+		"no-useless-concat": "warn",
+		"one-var": "warn",
+		"valid-jsdoc": "warn",
+		"vars-on-top": "warn"
 	}
 }

Gruntfile.js

@@ -9,8 +9,7 @@ module.exports = function ( grunt ) {
 	grunt.initConfig( {
 		eslint: {
 			options: {
-				cache: true,
+				cache: true
-				reportUnusedDisableDirectives: true
 			},
 			all: [
 				'**/*.js',

package.json

@@ -4,10 +4,10 @@
 		"test": "grunt test"
 	},
 	"devDependencies": {
-		"eslint-config-wikimedia": "0.5.0",
+		"eslint-config-wikimedia": "0.15.0",
 		"grunt": "1.0.4",
 		"grunt-banana-checker": "0.8.1",
-		"grunt-eslint": "20.1.0",
+		"grunt-eslint": "22.0.0",
 		"grunt-jsonlint": "1.1.0"
 	}
 }