Put deleteNoSync as public

LeStorage/SyncedCollection.swift

@@ -290,11 +290,11 @@ public class SyncedCollection<T : SyncedStorable>: BaseCollection<T>, SomeSynced
     }
     
     /// Deletes the instance in the collection without synchronization
-    func deleteNoSync(instance: T) {
+    public func deleteNoSync(instance: T, cascading: Bool = false) {
         defer {
             self.setChanged()
         }
-        self.deleteItem(instance, shouldBeSynchronized: false)
+        self.deleteItem(instance, shouldBeSynchronized: cascading)
     }
     
     /// Deletes the instance in the collection without synchronization