Make app work with login.

lib/util/urlutil.js

@@ -0,0 +1,17 @@
+var url = require('url')
+
+module.exports.addParams = function(originalUrl, params) {
+  var parsed = url.parse(originalUrl, true)
+  parsed.search = null
+  for (var key in params) {
+    parsed.query[key] = params[key]
+  }
+  return url.format(parsed)
+}
+
+module.exports.removeParam = function(originalUrl, param) {
+  var parsed = url.parse(originalUrl, true)
+  parsed.search = null
+  delete parsed.query[param]
+  return url.format(parsed)
+}