Minor improvements of security and portability. 

1. Uses default html pages to deny directory listing. 

In case the user deploys this app without .htaccess, default html pages can prevent the public from knowing the directory structure of sensitive folders. 

2. Moves config.inc.php to config.inc.php.example

Adds config.inc.php to .gitignore, so that when the user needs to deploy the app to different targets with different configurations, the configurations will not interfere with each other. That way when the user pulls new commits from github the configurations will not be overwrited. 

Provides a template file config.inc.php.example.