added a simple test for the host_redirect middleware using mocha and should.js

package.json

@@ -8,6 +8,8 @@
     "coffeekup": "0.3.1"
   },
   "devDependencies": {
-    "docco": "0.3.0"
+    "docco": "*",
+    "mocha": "*",
+    "should": "*"
   }
 }