Change acceptance tests to reflect the fact that the fetch method of FeedClient (which must be stubbed during testing) is now a class-level, not instance-level method.
WIP: acceptance tests for the feeds sidebar.
Use the folder database id for the folder in the html, instead of generating a random id.
WIP: acceptance tests for navigating the folders in the sidebar.
WIP: acceptance tests for the folders in the feeds view. Added the possibility to read all entries for all subscribed feeds in a single list.