Improve CLI controls

[vezaynk]

Currently the CLI allows an on-the-fly override of the target file and the url. This can be pushed further by allowing each option to be as well.

php sitemap.php file=/home/user/public_html/sitemap.xml url=http://www.mywebsite.com/

_{Note 1: Debug controls are not necessary Note 2: url will be renamed to site}