Issue #189: Porting Admin Menu to Backdrop. Removing Toolbar.
Issue #189: Include top-level tabs as children in admin menu.
Issue #189: Incrementing update number to enable admin menu.
Merge pull request #207 from quicksketch/189/admin_menu

Issue #189: Porting Admin Menu to Backdrop. Removing Toolbar.
Issue #189: Adding safety check to Admin Menu update.