title: slickgrid : how to know which rows are dirty
body: <p>The slickgrid is pretty good!
  In disconnected mode, the user makes some changes.
  when the job is done the changes are to be saved on the server.
  I would like to know if there is a convenient way to update the database.
  the dataview contains the up-to-date data, is it aware of the changes that occurred since the loading (e.g. the deleted rows) or do we need to track on ourself the changes?</p>