Added Auth library

+<?php
+class Auth {
+    const REG_METH_AUTO_REG    = 1;
+    const REG_METH_VALID_EMAIL = 2;
+
+    const FORGOT_METH_VALID_EMAIL = 1;
+    const FORGOT_METH_RAND_PASS   = 2;
+
+    const ACTION_ACTIVATE = 'activate_account';
+
+    public static function make() {
+        static $made = false;
+        if (true === $made) {
+            throw new Exception('Auth has already been instantiated');
+        }
+        $made = true;
+
+        // if _GET activate self::activate();
+    }
+
+    /**
+     * Attempts to login the user
+     * @param {String} $username
+     * @param {String} $password
+     * @param {Boolean} $remember
+     * @returns WP_User instance
+     * @throws LogicException If headers have already been passed
+     * @throws InvalidArgumentException If the authentication is invalid
+     */
+    public static function login($username, $password, $remember = true) {
+        if (headers_sent()) {
+            throw new LogicException('Unable to login because headers have been sent');
+        }
+
+        $auth = _signon(Array(
+            'user_login'    => $username
+          , 'user_password' => esc_sql($password)
+          , 'remember'      => $remember
+        ));
+
+        $ref = new ReflectionObject($auth);
+        if ($ref->name == 'WP_User') {
+            return $auth;
+        }
+
+        throw new InvalidArgumentException('Invalid username/password');
+            //$auth->get_error_message()); this would be nice except it links to a wp-page
+    }
+
+    /**
+     * Attempts to log the user out
+     * @returns Boolean
+     * @throws LogicException If HTTP headers have already been sent
+     */
+    public static function logout() {
+        if (headers_sent()) {
+            throw new LogicException('Unable to logout because headers have been sent');
+        }
+
+        _logout();
+
+        return true;
+    }
+
+    public static function register($user_data = Array(), $registration_method) {
+    }
+
+    public static function activate() {
+        do_action(self::ACTION_ACTIVATE, $user_id);
+    }
+
+    public static function forgot_password($username, $forgot_method) {
+        
+    }
+}
+
+class Auth_Validation {
+    public static $errors = Array();
+
+    /**
+     * @rule Not blank
+     * @rule Valid WordPress username
+     * @returns Boolean
+     */
+    public static function username($val) {
+        if (empty($val)) {
+            self::$errors[] = 'Username is blank';
+            return false;
+        }
+
+        require_once(ABSPATH . WPINC . DIRECTORY_SEPARATOR . 'registration.php');
+        if (!validate_username($val)) {
+            self::$errors[] = 'Username must be at least 4 characters, letters and numbers only';
+            return false;
+        }
+
+        if (username_exists($_POST['reg_username'])) {
+            self::$errors[] = 'Username already exists';
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @rule Not blank
+     * @returns Boolean 
+     */
+    public static function password($val) {
+        if (empty($val)) {
+            self::$errors[] = 'Password can not be blank';
+            return false;
+        }
+        self::$pass_check = $val;
+
+        return true;
+    }
+
+    /**
+     * @rule Valid email address (*@*.*)
+     * @returns Boolean
+     */
+    public static function email($val) {
+        if (!(boolean)filter_var($val, FILTER_VALIDATE_EMAIL)) {
+            self::$errors[] = 'Invalid email address';
+            return false;
+        }
+
+        if (false !== email_exists($val)) {
+            self::$errors[] = 'Email address already registered';
+            return false;
+        }
+
+        return true;
+    }
+}
+?>
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