Added option to specify the suffix names of screenshot types.
Added option to specify the suffix names of screenshot types.

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