Add optional fedmenu resources to every page.
    
    This is for https://fedoraproject.org/wiki/Fedora_Engineering/FY16_Plan
    
    If the FEDMENU_URL and FEDMENU_DATA_URL options are left out of the
    config, then nothing should change on the displayed page.  If they are
    included, then they will be pulled in at page load time to render little
    menu buttons on the bottom right hand corner of the page.
    
    There's an example up at http://threebean.org/fedmenu/
    
    It will be a while until we are able to turn this on globally across all
    our apps.