logic to call it every 5 minutes
make use of visibility API/jquery-visibility to perform the ajax call only if the browser is visible/in use

replace missing calls to OC.Notification.show

 refs https://github.com/owncloud/core/commit/ae54364d7c8baf5138d166855db6431190963886

adding file name checks and notifications to isFileNameValid() for . and empty file name

enable enter in ie by using .submit()+form instead of .change(), use notifications when name is empty

storage warnings are displayed in a notification.
as soon as a notification is hidden the storage warning will come back.

the maximum upload size is updated within the browser once an upload or delete operation has been finished