build: Updating npm dependencies

* eslint-config-wikimedia: 0.22.1 → 0.24.0
  The following rules are failing and were disabled:
  * strict

* grunt: 1.5.3 → 1.6.1
* stylelint-config-wikimedia: 0.13.1 → 0.14.0
  The following rules are failing and were disabled:
  * selector-pseudo-element-colon-notation

Change-Id: If82350c9b111b8d590d0f89d6f51caa33ef46f30

.eslintrc.json

@@ -2,5 +2,8 @@
 	"root": true,
 	"extends": [
 		"wikimedia/server"
-	]
+	],
+	"rules": {
+		"strict": "warn"
+	}
 }

.stylelintrc.json

@@ -1,6 +1,7 @@
 {
 	"extends": "stylelint-config-wikimedia",
 	"rules": {
-		"declaration-property-unit-disallowed-list": null
+		"declaration-property-unit-disallowed-list": null,
+		"selector-pseudo-element-colon-notation": null
 	}
 }

package.json

@@ -6,13 +6,13 @@
 		"test": "grunt test"
 	},
 	"devDependencies": {
-		"eslint-config-wikimedia": "0.22.1",
-		"grunt": "1.5.3",
+		"eslint-config-wikimedia": "0.24.0",
+		"grunt": "1.6.1",
 		"grunt-banana-checker": "0.10.0",
 		"grunt-eslint": "24.0.0",
 		"grunt-stylelint": "0.18.0",
 		"postcss-less": "6.0.0",
-		"stylelint-config-wikimedia": "0.13.1",
+		"stylelint-config-wikimedia": "0.14.0",
 		"svgo": "2.8.0"
 	},
 	"eslintIgnore": [