Refactored: Activity implements PropertyChangeListener interface
Fixed: Drawer crushing onSlideCompleded
Refactored: MainActivity user interface buttons
Added wrong activity
Revert 922d6e6..715ae13

This rolls back to commit 922d6e6d6251e5550b89e9070f2e7fe0d3b65317.
Added: VerticalGalleryActivity, VGA order initialization
Added: Initialization