Support for jquery ui 1.11

[gvas]

jQuery UI 1.11 removed the requirement to use anchors in menu items. Markup containing anchors will still work, but there are styling issues. This PR adds support for initialization of the menu from an anchor-less HTML markup.

A breaking change is that the menu command was moved from the <a> element's href attribute to the data-command attribute of the <li> element.

[mar10]

très cool. I'll look into it over the weekend, but I noticed that in the demo/index.html the icons seem to be broken when I include this:

    <link type="text/css" rel="stylesheet" href="https://code.jquery.com/ui/1.11.0/themes/ui-lightness/jquery-ui.css" />
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" type="text/javascript"></script>
    <script src="https://code.jquery.com/ui/1.11.0/jquery-ui.min.js" type="text/javascript"></script>

[gvas]

The themeswitcher must also be configured to load the correct stylesheet:

    $("#switcher").themeswitcher({
        jqueryuiversion: "1.11.0",
        imgpath: "../lib/Super-Theme-Switcher/images/",
        loadTheme: "Smoothness"
    });