keybinding improvements
keybinding improvements

 - tabs are opened relative to current tab
 - cmd 1-9 moves right x tabs. shift+cmd+1-9 moves left x tabs.
 - bug fixes

valtlfelipe/min,plrenaudin/min,minbrowser/min,doreminiature/miniature,doreminiature/miniature,matheus208/min,matheus208/min,minbrowser/min,plrenaudin/min,valtlfelipe/min,valtlfelipe/min,minbrowser/min,plrenaudin/min