upgraded to vaadin 7.1.8 and signature appears to have changed.
removed some warnings.
Fixed a bug where the grid was being passed to the form helper rather
than the multi-form layout. The result was that addComponent was being
called directly on the grid which meant our layout logic wasn't being
applied.
Added getCaption so that the label would be displayed correctly.
Changed the content mode of the message to all html.
upgrade 7.1.8