WIP: show alerts if fees or foldes cannot be loaded during page load.
Added exception handler to FeedsController#index. Total number of feeds and unread entries is not calculated in the server but rather in the client with angularjs.
Show alert when feeds cannot be loaded from the server via AJAX on page load.
Changed the way total unread entries count is hidden while initializing the client. The old strategy was not working properly.
Added acceptance test to check that an alert is shown if there is a problem loading folders via AJAX on page load.