amqplib: Test with 0.4.x

Since that is what people will get when they npm install

Author: jonnor

package.json

@@ -21,7 +21,7 @@
     "uuid": "^2.0.1"
   },
   "devDependencies": {
-    "amqplib": "^0.3.0",
+    "amqplib": "^0.4.0",
     "chai": "~1.9.0",
     "grunt": "~0.4.1",
     "coffee-script": "^1.8.0",