move phantom_script.js setInterval into page.open callback

Until I made this I always got only ```<head/>``` with it's content, ```<body>``` was empty.

It seems setInterval script was finished earlier then url content was loaded to the page. Maybe because I have subscriptions with response time lower then 100ms so they were ready very quickly — database server in the same data center.

http://phantomjs.org/api/webpage/method/open.html