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
fix save attachments
set min width for save attachment button
fix save attachments
fix storing of attachments
don’t change text of attachment save buttons, only use icons