Shortcut to open Searchbar and Image Positioning Fix

Added "/" for opening the Searchbar and <ESC> for closing it again.
(And "g" for Google+, which is personal preference and a "can be included". But I prefer the popup over a new tab.)

Also fixes a bug in which fast keyboard navigation displays the next open Feed in the middle with a big picture truncated, because it wasnt loaded fast enough to detect height. Simply added preloading next Feed.