build: update dependencies

grunt-contrib-jshint 0.11.3 has some deep dependencies that trigger
warnings:

warning grunt-contrib-jshint > jshint > minimatch@2.0.10:
Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue

warning grunt-contrib-jshint > jshint > cli > glob > minimatch@0.3.0:
Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue

Updated it to latest, and while at it update other dependencies.

Change-Id: Ic56e44c1de9c5d4be7be39005fb5fc14318c0925

package.json

@@ -5,9 +5,9 @@
   },
   "devDependencies": {
     "grunt": "1.0.1",
-    "grunt-banana-checker": "0.4.0",
-    "grunt-contrib-jshint": "0.11.3",
-    "grunt-jsonlint": "1.0.7",
+    "grunt-banana-checker": "0.6.0",
+    "grunt-contrib-jshint": "1.1.0",
+    "grunt-jsonlint": "1.1.0",
     "grunt-stylelint": "0.7.0",
     "stylelint": "7.8.0",
     "stylelint-config-wikimedia": "0.4.1"