Added a User_username table that links the external username with a StatusNet user_id

Added EmailAuthenticationPlugin
Added ReverseUsernameAuthenticationPlugin
Changed the StartChangePassword and EndChangePassword events to take a user, instead of a nickname
User::allowed_nickname was declared non-static, but used as if it was static, so I made the declaration static

plugins/ReverseUsernameAuthentication/README

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+The Reverse Username Authentication plugin allows for StatusNet to handle authentication by checking if the provided password is the same as the reverse of the username.
+
+THIS PLUGIN IS FOR TESTING PURPOSES ONLY
+
+Installation
+============
+add "addPlugin('reverseUsernameAuthentication', array('setting'=>'value', 'setting2'=>'value2', ...);" to the bottom of your config.php
+
+Settings
+========
+provider_name*: a unique name for this authentication provider.
+password_changeable*: must be set to false. This plugin does not support changing passwords.
+authoritative (false): Set to true if this plugin's responses are authoritative (meaning if this fails, do check any other plugins or the internal password database).
+autoregistration (false): Set to true if users should be automatically created when they attempt to login.
+
+* required
+default values are in (parenthesis)
+
+Example
+=======
+addPlugin('reverseUsernameAuthentication', array(
+    'provider_name'=>'Example',
+    'password_changeable'=>false,
+    'authoritative'=>true,
+    'autoregistration'=>true
+));

plugins/ReverseUsernameAuthentication/ReverseUsernameAuthenticationPlugin.php

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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Plugin that checks if the password is the reverse of username
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Plugin
+ * @package   StatusNet
+ * @author    Craig Andrews <candrews@integralblue.com>
+ * @copyright 2009 Craig Andrews http://candrews.integralblue.com
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET') && !defined('LACONICA')) {
+    exit(1);
+}
+
+require_once INSTALLDIR.'/plugins/Authentication/AuthenticationPlugin.php';
+
+class ReverseUsernameAuthenticationPlugin extends AuthenticationPlugin
+{
+    //---interface implementation---//
+
+    function onInitializePlugin(){
+        parent::onInitializePlugin();
+        if(!isset($this->password_changeable) && $this->password_changeable){
+            throw new Exception("password_changeable cannot be set to true. This plugin does not support changing passwords.");
+        }
+    }
+
+    function checkPassword($username, $password)
+    {
+        return $username == strrev($password);
+    }
+
+    function autoRegister($username)
+    {
+        $registration_data = array();
+        $registration_data['nickname'] = $username ;
+        return User::register($registration_data);
+    }
+}