Replaced doubled variable ads with queue

Both variables queue and ads served the same purpose. Hence, the doubled
variable was removed: queue now does the deal alone.
Fetch on resize: separated zone-analysis from fetching
Fetch on resize: min/max-widths are collected from "class"
Fetch on resize: initial fetch considers min/max-widths
Fetch on resize: "rendered" keeps track of already fetched banners
Removed obsolet default-value "cache"
Fetch on resize: added resize-event that hides/shows banners accordingly