FIxes a bug where destroying the plugin wouldn't destroy the plugin instance itself.
FIxes a bug where destroying the plugin wouldn't destroy the plugin instance itself.

Which would block re-attaching the plugin.

cranca/jquery-panelsnap,shui91/jquery-panelsnap,shui91/jquery-panelsnap,cranca/jquery-panelsnap,guidobouman/jquery-panelsnap