build: Updating npm dependencies for security issues

* Updated grunt to 1.0.4, addressing:
  * https://npmjs.com/advisories/788
  * https://npmjs.com/advisories/813

Committed package-lock.json (T179229) too.

Change-Id: Ie91f8e29e619248f8f224e21f36c02b483a64e44

package.json

@@ -4,7 +4,7 @@
 		"test": "grunt test"
 	},
 	"devDependencies": {
-		"grunt": "1.0.3",
+		"grunt": "1.0.4",
 		"grunt-banana-checker": "0.4.0",
 		"grunt-contrib-jshint": "0.11.3",
 		"grunt-jscs": "2.5.0",