Move defaault script link out of head

>The problem caused by scripts is that they block parallel downloads. The [HTTP/1.1 specification](http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1.4) suggests that browsers download no more than two components in parallel per hostname. If you serve your images from multiple hostnames, you can get more than two downloads to occur in parallel. While a script is downloading, however, the browser won't start any other downloads, even on different hostnames.

- https://developer.yahoo.com/performance/rules.html#js_bottom