Support Hbbtv devices

[garritfra]

Fixes: #607
Supersedes: #609
Relates to: garritfra#8

Adds support for HbbTv information. Since I didn't receive any feedback on #607, I implemented the proposed solution. I'm happy to make adjustments if needed.

Here's a simple example:

    var parser = new UAParser();
    console.log(parser.getResult());

    var uastring = "Opera/9.80 (Linux mips; U; HbbTV/1.1.1 (;Sony; KDL32CX525; PKG4.027EUA; 2011;);; en) Presto/2.7.61 Version/11.00";
    parser.setUA(uastring);
    var result = parser.getResult();

    console.log(result.hbbtv);
    /*
            {
                version: "1.1.1",
                capabilities: "",
                "vendor": "Sony",
                "model": "KDL32CX525",
                "software": "PKG4.027EUA",
                "hardware": "2011"
            },
    */

[garritfra]

Superseded by #618.