Major memory leak

Hi

I found major memory leak.

In view_collection.c
static void view_collection_destroy(GtkObject *view_collection)
{
	VIEW_COLLECTION(view_collection)->filer_window = NULL;
}

It lacks parent call.
So the collection is never destroyed.

Also details.
https://github.com/jun7/rox-filer/commit/8b7626004527323ec7243a565a9d76a31f3a3322


In passing
https://github.com/jun7/rox-filer/commit/c8a685c97515c42ab0096e5730dbd01083befa01


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