Upgrade tutorial

This is a tutorial on how to upgrade WorkSimple.

Works with version 1.3.x

1. Firstly, back up blog.txt and conf.php, both found in the 'data' directory and also any custom themes.
2. Delete all WorkSimple files and directory (or just replace) and upload the new files.
3. If version >1.3.3, install WorkSimple. (You you cannot back up secret.php as 1.3.3 hashes the file)
4. Place blog.txt, conf.php back in the data directory.
5. If upgrading from 1.3.x to 1.3.4, you can delete do.php (deprecated now)
6. Place any themes you have backed up and place them in the themes directory.

You have successfully upgraded WorkSimple! Give yourself a pat on the back.