Support URL optimization with Apache's internal redirects

[benoitbryon]

Not sure how it works... but have a look at:

• http://us2.php.net/virtual
• https://httpd.apache.org/docs/2.2/mod/mod_include.html#includevirtual
• http://www.olivierpons.fr/2008/04/06/le-redirection-interne/
• http://stackoverflow.com/questions/270117/can-i-tell-apache-to-do-an-internal-redirect-from-php

... and see whether it makes it possible to mimic Nginx's X-Accel with Apache.

[benoitbryon]

See also #68