updateTitle cannot be set to false

[chmp]

Thanks for this great library. Setting it up was extremely simple and it works like a charm. However, I ran into a problem while trying to set updateTitle to false:

The updateTitle config value is set via updateTitle = cfg.updateTitle || updateTitle;. This way the updateTitle config value cannot be set to false, since it then evaluates to its previous value (true). The corresponding line should be replaced via updateTitle = (cfg.updateTitle !== undefined) ? cfg.updateTitle : updateTitle;.