CCS-1444 Update PHP SDK to properly handle base page url and current page url

Updated sdk code to handle the base url override.  So if the url is http://site.com/example.php?bvrrp=12325/reviews/product/1/product1.htm the "bvrrp=12325/reviews/product/1/product1.htm" will override the current page url variable example below.

 $bv = new BV(array(
        'deployment_zone_id' => 'Main_Site-en_US',
        'product_id' => 'PRTG2000',
        'cloud_key' => 'totalgymdirect-f19e9cfeb9917d0c20afdfbe06483f1b',
        'staging' => FALSE,
        'current_page_url' => 'bvrrp=12325/reviews/product/2/product1.htm',
    ));