dbus-manager: add a skeleton of NautilusDBusManager
dbus-manager: implement the CopyURIs method
dbus-manager: add an EmptyTrash operation
fixed: Adjust Default _zoom level always get the last "old" value

The callback function update_auto_enum should be connected before the default_zoom_level_changed, otherwise the new_level always get the last "old" value in default_zoom_level_changed and the desktop-view display strange.
Revert "dbus-manager: add an EmptyTrash operation"

This reverts commit 8116b5a43e11493d6e81a0a1e1ba67fa0d6289a4.
Revert "dbus-manager: implement the CopyURIs method"

This reverts commit be39d4a5f6b03a142e21d3d0448ef0e779e7e173.
Revert "dbus-manager: add a skeleton of NautilusDBusManager"

This reverts commit 08bc0644ebc869ff1db320cc2bdfc4a471a6f9ac.
Merge remote-tracking branch 'upstream/master'