Configuration pages changed to use new FF extension
    
    browserconfig.html was changed to use new FF extension. The page is completely Firefox specific therefore the title was changed from 'Configure browser' to 'Firefox configuration'. Instruction to import CA cert in unauthorized.html are FF specific too, so they were moved to browserconfig.html. Unauthorized.html text was changed to distinguish FF config and other browsers. Now the page shows link for FF (browserconfig.html) and other browsers (ssbrowser.html). Ssbrowser.html should be enhanced by more configurations and browsers later [1].
    
    Old configuration method was moved to ssbrowser.html.
    
    Unauthorized dialog in Web UI now links to http://../unauthorized.html instead of https. This change is done because of FF strange handling of extension installations from https sites [2]. Firefox allows ext. installation from https sites only when the certificate is signed by some build-in CA. To allow custom CAs an option in about:config has to be changed which don't help us at all because we wants to avoid manual changes in about:config.
    
    The design of browserconfig is inspired by Kyle Baker's design (2.1 Enhancements_v2.odt). It is not exactly the same. Highlighting of the steps wasn't used because in some cases we can switch some steps.
    
    Ticket: https://fedorahosted.org/freeipa/ticket/3094
    
    [1] https://fedorahosted.org/freeipa/ticket/823
    [2] https://bugzilla.mozilla.org/show_bug.cgi?id=688383