add the async module to the package.json

Author: peecky

package.json

@@ -13,7 +13,8 @@
     "formidable": ">=1.0.11",
     "imagemagick": ">=0.1.2",
     "lodash": ">= 0.9.2",
-    "mkdirp": ">= 0.3.4"
+    "mkdirp": ">= 0.3.4",
+	"async": "*"
   },
   "engines": {
     "node": ">= 0.8.8"