Bulk Operation

RAVE-27 Dont show the edit preferences button if the gadget does not have any user-editable preferences (either no prefs or all hidden)

RAVE-27 Implement container side support for set_pref gadgets.rpc call

RAVE-27 Figure out how to get the current view and re-render in the current view instead of defaulting to the home view when preferences are saved

RAVE-27 Implement proper error checking for "required" userprefs

RAVE-27 Implement save/cancel handlers for edit prefs UI which use the REST api to persist preferences and re-render the widget with the updated preferences

RAVE-27 Add preferences button to gadget chrome bar which generates the UI for editing preferences onclick

RAVE-27 Add the metadata required to dynamically generate the preferences UI on the client side into the widget object

RAVE-27 Create REST API for persisting RegionWidget preferences

RAVE-27 Enhance RegionWidget model to support storing RegionWidgetPreference's