Merge branch 'develop' of git://github.com/EllisLab/CodeIgniter into develop

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+#############################
+Upgrading from 1.3.3 to 1.4.0
+#############################
+
+.. note:: The instructions on this page assume you are running version
+	1.3.3. If you have not upgraded to that version please do so first.
+
+Before performing an update you should take your site offline by
+replacing the index.php file with a static one.
+
+Step 1: Update your CodeIgniter files
+=====================================
+
+Replace the following directories in your "system" folder with the new
+versions:
+
+.. note:: If you have any custom developed files in these folders please
+	make copies of them first.
+
+-  application/config/**hooks.php**
+-  application/config/**mimes.php**
+-  codeigniter
+-  drivers
+-  helpers
+-  init
+-  language
+-  libraries
+-  scaffolding
+
+Step 2: Update your config.php file
+===================================
+
+Open your application/config/config.php file and add these new items::
+
+
+
+    /*
+    |--------------------------------------------------------------------------
+    | Enable/Disable System Hooks
+    |--------------------------------------------------------------------------
+    |
+    | If you would like to use the "hooks" feature you must enable it by
+    | setting this variable to TRUE (boolean).  See the user guide for details.
+    |
+    */
+    $config['enable_hooks'] = FALSE;
+
+
+    /*
+    |--------------------------------------------------------------------------
+    | Allowed URL Characters
+    |--------------------------------------------------------------------------
+    |
+    | This lets you specify which characters are permitted within your URLs.
+    | When someone tries to submit a URL with disallowed characters they will
+    | get a warning message.
+    |
+    | As a security measure you are STRONGLY encouraged to restrict URLs to
+    | as few characters as possible.  By default only these are allowed: a-z 0-9~%.:_-
+    |
+    | Leave blank to allow all characters -- but only if you are insane.
+    |
+    | DO NOT CHANGE THIS UNLESS YOU FULLY UNDERSTAND THE REPERCUSSIONS!!
+    |
+    */
+    $config['permitted_uri_chars'] = 'a-z 0-9~%.:_-';
+
+Step 3: Update your user guide
+==============================
+
+Please also replace your local copy of the user guide with the new
+version.