function closeAllLiveBrowsers() {
        //make a copy incase the array is edited as we iterate
        var closeIDs = liveBrowserOpenedPIDs.concat();
        return Async.doSequentially(closeIDs, closeLiveBrowser, false);
    }
closeAllLiveBrowsers
Closes all the browsers that were tracked on open
TODO: does not seem to work on Windows
@return {$.Promise}