Extract documentation samples from test cases

[ArnaudBuchholz]

We need to create a link between an API and the associated test cases.
Caption should be possible through a special tag

Proposal:

• In the source file, @gpf.sample ID [caption]

/**
 * @gpf:sameas _gpfWebTagCreateFunction
 * @since 0.2.1
 * @gpf:sample DIV
 */
gpf.web.createTagFunction = _gpfWebTagCreateFunction;

• In the associated test file: function () {

        it("supports tree building (parameters)", function () {
            // @gpf:sample DIV
            var div = gpf.web.createTagFunction("div"),
                span = gpf.web.createTagFunction("span"),
                tree = div({className: "test1"}, "Hello ", span({className: "test2"}, "World!"));
            assert(tree.toString() === "<div class=\"test1\">Hello <span class=\"test2\">World!</span></div>");
        });