* Add body classes argument
Note that the additional function argument for getHTTPHead() includes a default argument for backwards compatibility with the API.
* Add page-specific classes
Allows easy styling of each page
* Change root CSS class to 'home'
Trying to avoid confusion between the class for the root level and the CSS ":root" pseudo-class
* Use conditional body class spacing
Avoids an extra space if a body class is set, but an empty string is passed to the function
Dave Madison