fix indent
move selectedObject(s)
rename currentObjects to _selectedObjects
Convert SelectedObjects to DependencyProperty
Merge remote-tracking branch 'origin/SelectedObject_As_DependencyProperty' into develop
Change namespace

The old namespace System.Windows.Controls.wpfpropertygrid implies that
it's part of Windows stock controls which is not the case.
Also it cause problems with actual system controls and with missing
'usings'.