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-#############################
-Upgrading from 1.7.2 to 2.0.0
-#############################
-
-Before performing an update you should take your site offline by
-replacing the index.php file with a static one.
-
-*******************
-Update Instructions
-*******************
-
-Step 1: Update your CodeIgniter files
-=====================================
-
-Replace all files and directories in your "system" folder **except**
-your application folder.
-
-.. note:: If you have any custom developed files in these folders please
-	make copies of them first.
-
-Step 2: Adjust get_dir_file_info() where necessary
-=====================================================
-
-Version 2.0.0 brings a non-backwards compatible change to
-get_dir_file_info() in the :doc:`File
-Helper <../helpers/file_helper>`. Non-backwards compatible changes
-are extremely rare in CodeIgniter, but this one we feel was warranted
-due to how easy it was to create serious server performance issues. If
-you *need* recursiveness where you are using this helper function,
-change such instances, setting the second parameter, $top_level_only
-to FALSE::
-
-	get_dir_file_info('/path/to/directory', FALSE);
-
-Step 3: Convert your Plugins to Helpers
-=======================================
-
-2.0.0 gets rid of the "Plugin" system as their functionality was
-identical to Helpers, but non-extensible. You will need to rename your
-plugin files from filename_pi.php to filename_helper.php, move them to
-your helpers folder, and change all instances of::
-
-	$this->load->plugin('foo');
-
-to ::
-
-	$this->load->helper('foo');
-
-
-Step 4: Update stored encrypted data
-====================================
-
-.. note:: If your application does not use the Encrypt library, does
-	not store Encrypted data permanently, or is on an environment that does
-	not support Mcrypt, you may skip this step.
-
-The Encrypt library has had a number of improvements, some for
-encryption strength and some for performance, that has an unavoidable
-consequence of making it no longer possible to decode encrypted data
-produced by the original version of this library. To help with the
-transition, a new method has been added, encode_from_legacy() that
-will decode the data with the original algorithm and return a re-encoded
-string using the improved methods. This will enable you to easily
-replace stale encrypted data with fresh in your applications, either on
-the fly or en masse.
-
-Please read :doc:`how to use this
-method <../libraries/encrypt>` in the Encrypt library
-documentation.
-
-Step 5: Remove loading calls for the compatibility helper.
-==========================================================
-
-The compatibility helper has been removed from the CodeIgniter core. All
-methods in it should be natively available in supported PHP versions.
-
-Step 6: Update Class extension
-==============================
-
-All core classes are now prefixed with CI\_. Update Models and
-Controllers to extend CI_Model and CI_Controller, respectively.
-
-Step 7: Update Parent Constructor calls
-=======================================
-
-All native CodeIgniter classes now use the PHP 5 \__construct()
-convention. Please update extended libraries to call
-parent::\__construct().
-
-Step 8: Move any core extensions to application/core
-====================================================
-
-Any extensions to core classes (e.g. MY_Controller.php) in your
-application/libraries folder must be moved to the new 
-application/core folder.
-
-Step 9: Update your user guide
-==============================
-
-Please replace your local copy of the user guide with the new version,
-including the image files.
-
-
-************
-Update Notes
-************
-
-Please refer to the :ref:`2.0.0 Change Log <2.0.0-changelog>` for full
-details, but here are some of the larger changes that are more likely to
-impact your code:
-
-- Scaffolding has been removed.
-- The CAPTCHA plugin in now a :doc:`helper </helpers/captcha_helper>`.
-- The JavaScript calendar plugin was removed.
-- The *system/cache* and *system/logs* directories are now in the application
-  directory.
-- The Validation class has been removed.  Please see the
-  :doc:`Form Validation library </libraries/form_validation>`
-- "default" is now a reserved name.
-- The xss_clean() function has moved to the :doc:`Security Class
-  </libraries/security>`.
-- do_xss_clean() now returns FALSE if the uploaded file fails XSS checks.
-- The :doc:`Session Class </libraries/sessions>` requires now the use of an
-  encryption key set in the config file.
-- The following deprecated Active Record functions have been removed:
-  ``orwhere``, ``orlike``, ``groupby``, ``orhaving``, ``orderby``,
-  ``getwhere``.
-- ``_drop_database()`` and ``_create_database()`` functions have been removed
-  from the db utility drivers.
-- The ``dohash()`` function of the :doc:`Security helper
-  </helpers/security_helper>`
-  has been renamed to ``do_hash()`` for naming consistency.
-
-The config folder
-=================
-
-The following files have been changed:
-
-- config.php
-- database.php
-- mimes.php
-- routes.php
-- user_agents.php
-
-The following files have been added:
-
-- foreign_chars.php
-- profiler.php
-\ No newline at end of file