Removing user ID from the cache directory name

As you may know, most cpanel based hosting have problems displaying a directory called '0', avoiding any work on those files (is a bit silly, as they are considered the null file :-)).

As this great module is really very, very helpful to take cpu under control when using a shared hosting, (which will likely use cpanel) I propose to modify that annoying '0', and as it is the uid of anonymous users, just add a prefix letter to keep that information in the path.

I have modified the function boost_cache_directory to pass a directory called 'a0' instead. Just substituting this

return implode('/', array(getcwd(), BOOST_FILE_PATH, $host, $user_id));

with this

return implode('/', array(getcwd(), BOOST_FILE_PATH, $host, 'a' . $user_id));

works fine (of course, .htaccess must be modified to reflect this change). This solution is quite easy and non-intrusive, and completely solves this silly roblem