Always show inbox and all-mail folders in navigation (even if empty)
Handle the loading of empty folders
Merge pull request #292 from zinks-/always-show-inbox

Show inbox if empty + handle empty folders
adding folder view based on marionette views
use handlebars by default in marionette views and keep folder list during mail setup
use Horde_Imap_Client_Mailbox object to allow proper access in subsequent calls
Merge pull request #301 from owncloud/fix-mailbox-access

use Horde_Imap_Client_Mailbox object to allow proper access in subsequen...
Merge pull request #281 from owncloud/folder-view

adding folder view based on marionette views
make folder list expandable, collapsed by default
add WIP and TODOs