adding redirect to the list of allowed attributes

Author: jamesjnadeau

firebase-login.html

@@ -10,7 +10,7 @@
 <link rel="import" href="firebase-import.html">
 <link rel="import" href="../polymer/polymer.html">
 
-<polymer-element name="firebase-login" attributes="location provider user autoLogin statusKnown params">
+<polymer-element name="firebase-login" attributes="location provider user autoLogin statusKnown params redirect">
 <!--
 Element wrapper for the Firebase authentication API (https://www.firebase.com/docs/web/guide/user-auth.html).