Fix incorrect lookup of global jQuery variable.
Fix incorrect lookup of global jQuery variable.

You need to look into the `window` variable or it will throw an undefined error.

smrq/PhantomCSS,tazminweb/PhantomCSS,tpgmartin/PhantomCSS,Huddle/PhantomCSS,tpgmartin/PhantomCSS,istr/PhantomCSS,istr/PhantomCSS,smrq/PhantomCSS,aeharding/PhantomCSS,tazminweb/PhantomCSS,aeharding/PhantomCSS,gdseller/PhantomCSS,Huddle/PhantomCSS,gdseller/PhantomCSS