lots of important changes

/:

index.php:

1. modified header to fit with modifications to include/functions.php
2. added extra class to clear-row. May change later on
3. indentation

themizer.php:

1. created

tryit.php:

1. Replaced include/header.php with generateHeader()

include/functions.php:

1. Added uncleverly-named array that converts $title to names for
   stylesheets. It remains to be seen how this works out.
2. replaced css/stylesheet.css with css/general.css
3. added new variable $titleAdd for additional title info

css/:

index.css:

1. Created

general.css:

1. Moved index-specific content to css/index.css

stylesheet.css:

1. removed

themizer.css:

1. created