Log Message:
lgogdownloader: update to 3.15.

LGOGDownloader 3.15

    Changed Galaxy CDN priority handling to be more generic
    Changed default Galaxy CDN priority to \ 
"edgecast,akamai_edgecast_proxy,fastly"
    Added option to list available CDNs
        --galaxy-list-cdns
    Added option to force browser based login
        --browser-login
    Fixed login check when redirected to embedded version of website
    Fixed handling Fastly CDN urls
    Fixed crash caused by errors in html to xhtml conversion