update devDependencies

package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "font-awesome": "4.2.0",
     "grunt": "0.4.5",
-    "grunt-concurrent": "0.5.0",
+    "grunt-concurrent": "1.0.0",
     "grunt-contrib-clean": "0.6.0",
     "grunt-contrib-coffee": "0.11.1",
     "grunt-contrib-compress": "0.11.0",
@@ -46,7 +46,7 @@
     "grunt-contrib-copy": "0.5.0",
     "grunt-contrib-watch": "0.6.1",
     "grunt-crx": "0.3.3",
-    "grunt-shell": "1.0.1",
+    "grunt-shell": "1.1.1",
     "load-grunt-tasks": "0.6.0"
   },
   "repository": {