refactor the $rewrites parameter in Phar::webPhar. Now it is a callback
that accepts the path requested. This callback should return the actual filename
requested as a string, or false to deny access as HTTP 403.
Also fix incorrect munging of SCRIPT_NAME variable in mungServer
More importantly, Phar::webPhar now finds the filename hidden in:
http://localhost/myphar.phar/internal/file.php/extra/stuff
as 'internal/file.php' in phar 'myphar.phar' with REQUEST_URI '/internal/file.php/extra/stuff'
this will allow pharring up apps that use REQUEST_URI for front controller stuff.
