Move functional code out of config.php

[craywolf]

Many changes, all geared to cleaning up config.php:

• Removed all code from config.php-dist except for setting variables
• Moved the functional bits into index.php instead
• Improved handling of passing $count in the URL
• Removed some options from config.php-dist that didn't make sense to be user-configurable
• Changed the exclude/include variables so they're both just include
• Added error handling in case the user doesn't create a config.php
• Added lots of comments