Issue #32 - Manually handle submenus

* Use the same layout for a better consistency.
* Overflow item is now a submenu
Issue #32 - Display a Toast when syncing

* Ensure an immediate feedback is provided
Issue #32 - Disable non-registration surveys

* Refresh SurveyListFragment on record change
* If there are no responses yet, disable some surveys
Issue #32 - Add menu overflow icon