Support generate the namespace of the parser object (specified by the moduleName)

[sammyhk]

As titled.
Now it is not generate the namespace, so we need to prepare the namespace object somewhere else before including the generated parser script, request to generate the namespace object. The generated code should be:

• module name without namespace (i.e. moduleName = "myParser"):

var myParser = (function () { // same as before
})();

• module name with single level namespace (i.e. moduleName = "jison.myParser"):

var jison;
(function (jison) {
    jison.myParser = (function () { // same as before
    })();
})(jison || (jison = {})); // only create new object if not exists

• module name with nested namespace (i.e. moduleName = "com.zaach.jison.myParser"):

var com;
(function (com) {
    var zaach;
    (function (zaach) {
        var jison;
        (function (jison) {
            jison.myParser = (function () { // same as before
            })();
        })(jison = zaach.jison || (zaach.jison = {}));
    })(zaach = com.zaach || (com.zaach = {}));
})(com || (com = {}));