btw_tr.js: insert_ref should be able to set the caret immediately

[lddubeau]

As of 0.1.2 the following code must be used for the tests to pass:

$(gui_node).one('wed-refresh', function () {
    editor.setGUICaret(
        gui_node,
        _indexOf.call(gui_node.childNodes,
                      $(gui_node).children("._ref_abbr")[0]) + 1);
});

What we'd like is not have to wait for a custom event:

editor.setGUICaret(
    gui_node,
       _indexOf.call(gui_node.childNodes,
                  $(gui_node).children("._ref_abbr")[0]) + 1);

The version of the code without the custom event works fine when using BTW manually. However, it fails when testing with Selenium. There is probably a race condition occurring.

The tests that fail when using the version without the custom event are:

selenium_test/bibliographical_references.feature:16 adding custom text to a reference
selenium_test/bibliographical_references.feature:24 adding custom text to a reference when there is already text